First Trimester of Pregnancy Symptoms Week by Week

In the first trimester of pregnancy symptoms week by week of  your pregnancy,the body works at full speed. The emotional balance can also be confused – body and soul come into “other circumstances”.Below we have outlined the 1st to 4th week of pregnancy symptoms week by week.

First Trimester of Pregnancy Symptoms Week by Week

Congratulations on the pregnancy! Now begins a beautiful and exciting time for you. You still do not realize that you are pregnant, but inside you are already around. From the 4th week of pregnancy could be the first small signs, such as breast tenderness, morning sickness or constipation noticeable. Therefore, pay attention to your health and refrain from alcohol, nicotine and medication.

From the last menstrual period to the emergence of new life

On the 1st, 2nd, 3rd and 4th week of pregnancy (the first month of pregnancy), it is decided whether a new life will arise in this cycle or not. The first two weeks are above all a mathematical size. Ovulation and thus the possibility of fertilization only follow towards the end of the second or the beginning of the third week.

In the first and second week, therefore, the woman is not yet pregnant. Since the time of ovulation in the fewest women can be determined exactly, a pregnancy is calculated from the well-known first day of the last period and then lasts 40 weeks.

Read Also:13 Weeks Pregnant what to Expect

Based on the data, the doctor wins through the various ultrasound examinations of the baby, the predicted birth date is often adjusted later. If the ovum is fertilized during the 3rd week of gestation, it will be followed by a very sensitive phase.

By the end of the 4th week of pregnancy it will be decided whether the embryo succeeds in getting lodged in the uterine lining or whether it will be eliminated with the next menstrual period.


Many women do not feel anything about these processes in the first to the fourth week of pregnancy, others feel the first signs of pregnancy shortly after fertilization. This can be proven by a blood test in the 4 weeks or by a urine test from the calculated first day of the next period respectively in the 5th week of pregnancy.

1st Week Symptoms – time of normal menstrual period and first preparations for pregnancy.In the first trimester of pregnancy symptoms week by week of pregnancy, the woman is not pregnant, but experiences her normal menstrual period. Nevertheless, her body creates many prerequisites for a potential pregnancy during this period as part of the normal cycle. Women who want to get pregnant can already do a lot in the first week of pregnancy to give their baby a good start.

Tip for 1- 4 Weeks Pregnancy Symptoms

No smoking in early pregnancy:The complete renunciation of alcohol and nicotine ensures that these pollutants do not even reach the germ cell – in the first trimester of pregnancy they have a particularly high potential for harm to the baby. Medicines – including natural remedies – should from now on only be used after a medical consultation.

For the smooth development of the brain and nervous system of the embryo, a sufficient supply of folic acid (vitamin B9, vitamin B11), especially in the first three months of pregnancy – the first trimester – indispensable, a folic acid deficiency can lead to severe developmental disorders and damage.

Natural folic acid is found in high concentrations in yeasts, wheat germs, wheat bran, veal and chicken liver, as well as in many vegetables, fruits and fish and meat. Women who want to have children should take 0.4 milligrams of folic acid daily, possibly in the form of a dietary supplement, before starting pregnancy and then from the first week of pregnancy onwards.

Read Also:Earliest Signs of Pregnancy You Need Know (An Easy How-To Guide)

2nd week of Pregnancy-Recurrence of fertility and ovulation

Also in the 2nd week of pregnancy the woman is not yet pregnant. Your body now creates the conditions for its fertility in this cycle by building the uterine lining and preparing for ovulation (ovulation). Around the middle of the cycle, a mature ova (follicle) bursts and “shoots” a mature egg into the fallopian tube funnel.

Supported by the numerous cilia, the ovum begins to migrate through the fallopian tube to the uterus. The ovum is viable only twelve to 24 hours after ovulation. Fertilization of the egg cell will take place towards the end of the second week or at the beginning of the next week. Since the male sperm cells survive around 2-5 days, the fertile days of the woman set in just a few days before ovulation. It is therefore fertile for a total of 6 days.

After the male orgasm, about 500 million sperm cells enter a “race” that only a single sperm wins. Fertilization of the egg usually takes place in the fallopian tube. For sperm this way is difficult, especially since they have to swim against the movements of the cilia. Record swimmers cope with this distance of 15 to 18 centimeters in about half an hour, others need it for days, many never reach their destination.

Although the outer egg sheath can be penetrated by multiple sperm cells, only one manages to penetrate the inner membrane of the egg cell. Which sperm cell is victorious, is decided by means of biochemical signals through the egg. Once the sperm enters the egg cell, it changes its chemical structure. This changes the voltage around the cell membrane, closing the way for all other sperm.

3rd Week Symptoms – the pregnancy begins

Again for the first trimester of pregnancy symptoms week by week, the actual pregnancy starts at the beginning of the 3rd week of pregnancy. Immediately after fertilization, there are two cell nuclei inside the egg: the nucleus of the ovum with the female genetic material, and the head of the spermatozoon with the male genetic information. Merging creates the unique genetic code of a new human being. A little later, this cell of origin (zygote) will divide for the first time, becoming the starting point of billions of other cells.

Folic acid in pregnancy

On the second day after fertilization, this cell cluster consists of four, one day later already eight cells. In the 3 weeks’ gestation its appearance resembles first of a mulberry (Latin: Morula), therefore scientists speak also of the Morula stage of the embryonic development. One day later, a cavity forms inside the cell cluster – the morula has progressed to the germinal bladder (blastocyst), which consists of two different cell types:

The actual embryo develops from the embryoblast – the baby carries this scientific name until the end of the first trimester. Only after all important organs have been developed, it will be called a fetus. The trophoblast produces the placenta, which, together with the umbilical cord connected to it, later takes over the baby’s nutrient and oxygen supply and disposes of the waste products of his metabolism.

First Trimester of Pregnancy Symptoms Week by Weeks

During the third week of pregnancy, the embryo relentlessly wanders from the fallopian tube to the uterus, which is usually reached at the beginning of the following week of pregnancy. When he arrives in the womb, he already has about 70 to 100 cells. Outward signs of pregnancy are not yet apparent at this early stage, most women do not even know at the 3rd week of pregnancy that they are pregnant.

However, fertilization initiates a variety of hormonal changes that help maintain pregnancy and further embryonic development. Immediately after ovulation, for example, the oocyte vesicle as a corpus luteum (Corpus Luteum) has taken on a new task: It now produces the corpus luteum hormone progesterone, which causes the structure of the uterine lining and is thus crucial for the implantation of the oocyte.

4th week Pregnancy Symptom – all or nothing!

On average, seven days after fertilization and at the beginning of the 4th week of gestation, the fertilized ovum nests in the uterus. In this phase, it decides after the “all-or-nothing principle” whether the pregnancy is maintained.

Immediately before implantation (nidation), the embryo can be damaged particularly easily by external influences. If the newly developing organism fails to compensate for such damage, its development stops – the germinal bladder is then “flushed out” along with the next period.

Shortly before the nidation, the embryo emerges from the surrounding sheath and then pierces the uterine lining until it is completely covered by it. Between the embryoblast and the trophoblasts the fruit cavity and the yolk sac are forming, which will provide for the supply of nutrients to the embryo in the next few weeks. From now on, the placenta forms around the nest egg. Towards the end of the 4th week of gestation, the embryo measures only half a millimeter – until birth, the baby reaches a length of about 51 to 52 centimeters and a through average weight of about 3,200 grams.

Read Also:Can You get Pregnant from withdrawal Method

Three cotyledons as organ plants

Embryonic cells are pluripotent until the 4th week of gestation – theoretically any organ could develop from each cell. From this week begins the cellular specialization. From the embryoblast develops the so-called germinal disc, which has a rounded shape. It is formed from two and soon after three cotyledons:

In the course of embryonic development, most of the internal organs – including the lungs, liver, pancreas, urinary bladder and urethra, as well as the inner digestive tract – will develop from the inner germ layer (endoderm).

From the middle cotyledon (mesoderm) develops the heart and blood vessels, connective tissue and skeleton, the smooth muscles of the intestines, the spleen, blood cells and the lymphatic system, the kidneys and the gonads and internal genitalia.

The outer cotyledon (ectoderm) forms the skin, nervous system and sensory organs.

First pregnancy marks in the mother

In the 4th week of pregnancy, many women feel the first physical signals of pregnancy. By nesting the embryo in the uterus, it can lead to the so-called Nidationsblutung, which manifests itself as a slight spotting. Often, the breasts begin to contract and contract painfully this week, and in some women the skin of the areolae is already darkening.

The production of the luteal hormone progesterone slows down the process of all body processes of pregnant women to protect the embryo, but also ensures that they often feel tired and the first pregnancy-related blockages report.

Some women already experience the first symptoms of pregnancy in the 4 weeks’ gestation: morning sickness, increased salivation, and an emotional “ups and downs” that will accompany them throughout the first trimester of pregnancy.

Read Also:Flying while Pregnant First And third Trimester

PREGNANCY WEEK 1- 4 (overview)

For first trimester of pregnancy symptoms week by week ,In the 1st, 2nd, 3rd and 4th week of pregnancy it is decided whether a pregnancy will occur in this monthly cycle. In the first two weeks there is no pregnancy. Since the time of ovulation is known only in very few women exactly, their beginning is scheduled on the first day of the last period. The calculated date of birth is about 40 weeks.

In the first week of pregnancy the woman has her regular menstrual period. By abstaining from alcohol and nicotine, self-medication and the intake of folic acid, which is vital for the healthy development of the baby, she can already ensure a good start of embryo development if she has a wish to have children.

At the end of the 2nd week of pregnancy or in the middle of the cycle, ovulation occurs. If the mature egg is fertilized now or at the beginning of the 3rd week of gestation, it will start the pregnancy.

In the 3rd week of gestation, the fertilized egg begins to divide and migrates from the fallopian tube to the uterus by the end of this week.

In the 4th week of pregnancy, the embryo settles in the uterine lining. This week, his cells specialize – from the three cotyledons with different cell types will form in the next few weeks and months, the various organ systems. Many women now feel the first pregnancy symptoms.

First Trimester of Pregnancy Symptoms Week by Week:Other Searches

first trimester symptoms

pregnancy week by week

5 weeks pregnant

first trimester weeks pictures

first trimester pregnancy

4 weeks pregnant

first trimester growth

second trimester of pregnancy


Please enter your comment!
Please enter your name here