1st month of pregnancy

Getting pregnant is the most beautiful moment for a lady in her life. The 1st Month of pregnancy brings with it a lot of physical and emotional changes in the mother.

But she doesn’t know clearly what changes happen with the baby inside her. She has no idea about How Prenatal development happens.

There are three stages of Prenatal development

  1. Germinal Stage – The first two weeks after conception is the germinal stage.
  2. Embryonic Stage – From the third week to the eighth week is the Embryonic Stage.
  3. Fetal Stage – From the ninth week until birth is known as fetal Stage.
Prenatal development

( Credits – happychildren.life )

We are going to explain 1st month pregnancy in this article baby growth during pregnancy week by week in the first month.

The first month of Pregnancy has been divided into four parts –

  1. 1st week of Pregnancy
  2. 2nd week of Pregnancy
  3. 3rd week of Pregnancy
  4. 4th week of Pregnancy

1. 1st Week of Pregnancy

In the first week, The mother doesn’t know she is pregnant. I know you are thinking that I am kidding but actually the first week of 1st month pregnancy doesn’t show any symptoms.

1st week of pregnancy

The first week is the stage when your body just prepares itself for pregnancy. There will be no sign of pregnancy. Some people also call this stage half pregnant.

i. How to know the Pregnancy date?

It is the doctor who confirms the pregnancy due date by tracking with the day of your last menstrual period. It looks pretty strange to know that the date of pregnancy is decided by the first date of your period. But in reality, It is not strange as it seems to be for some people.

Actually what happens is that When a couple has sex, the sperms enter into the women’s body which can survive for at most five days.

Within these five days egg come to greet them and they meet and fertilize due to which It is pretty hard to know exactly the date when egg and sperm meet.

Therefore, the Doctor sets the starting line of your 40 week pregnancy by your LMP ( Last Menstrual Period ).

The benefit of this system is that you get a pregnancy head start clocking in a full two of your 40 weeks before you are even expecting and showing any symptoms like gassy, bloated and swollen.

2. 2nd Week of Pregnancy

In the Second Week, the groundwork is started for the Ovulation. This is the most important first step towards the making of the baby which happens in the 1st month of pregnancy.

The work gets started in your brain where the hypothalamus, which is the control center in your brain, gets to work with the pituitary gland which comes in the role of a partner in reproduction.

i. Hormones Released

They start releasing hormones which are known as Follicle Stimulating Hormones and Luteinizing Hormones. These hormones then prompt the ovaries to get cracking on some eggs which results in ripening one to maturity within its follicle.

follicle stimulating hormone

All this egg action results in the making of two other powerful hormones known as Progesterone and Estrogen. These hormones then start the process of reproduction in your uterus.

Due to these hormones, Your uterus starts to thicken its lining and forms a blood pumped cushion, preparing the entry of a fertilized egg.

If you have a 26 days menstrual cycle then Around day 13, your ovary will start swelling and will then release the matured egg of the month.

ii. Starting of Ovulation

This egg, which will turn into your baby after a few months, leaves the ovary and starts traveling from the fallopian tube. It will take about a week to reach its destination, Uterus. This is the actual beginning of the ovulation.

Now, Millions of sperm have seen the egg coming. They are swimming faster than Usain Bolt now to reach the egg first. They are rushing toward that egg up through the cervix. Then they will get into the uterus and afterward on to the fallopian tube.

starting of ovulation

Success requires consistency and a lot of persistence due to which only one person wins a marathon. The same thing applies here also.

Out of millions of sperms, only one Persistent sperm survives that difficult journey to block the egg from going further & tunnel into its outer layers. The winning sperm then plunges into the egg’s nucleus and releases its own genetic contribution. The egg is officially fertilized now.

Keep in mind that On average only 30 – 40 percent chance is that your egg gets fertilized. Don’t take tension if you don’t get pregnant in this meanwhile.

iii. Pregnancy Symptoms Week 1 and 2

a. Change in body temperature –

Your body temperature will fluctuate while your body will do some process. It will low for a minute and then immediately shoots up also.

b. Cervical mucus

Mucus will change every week from now onwards. Currently, the mucus will be thick, Sticky and a bit creamy also.

3. 3rd Week of Pregnancy

Finally, this is the week when actual Pregnancy starts. One determined little sperm went through the test of endurance, entered your prepared egg and voila, you are pregnant.

Although it depends from person to person. Some people’s bodies work slowly and their pregnancy starts in the fourth week of the 1st month.

After the winner sperm gets with the fertilized Egg, The Egg which is called Zygote forms a strong border across itself to stop other sperms from getting in.

zygote egg

Then, Within a few hours, the Egg Zygote starts dividing itself into multiples of two and splits then again and again.

Approximately After 3 days of fertilization, your Egg zygote became a cute ball of 16 cells. This ball is known as Morula. It looks like a little cute berry which you will soon be calling your baby.

For the following not many days roughly 5 – 7 days, the Morula keeps on floating down from the fallopian tube, becoming a blastocyst. A blastocyst is a cluster of cells with nearly 100 cells in it.

Its destination is your Uterus, which will be its home for the next beautiful and exciting nine months. It will transform from blastocyst to embryo, then a fetus and ultimately a baby.

Surprisingly, The blastocyst has effectively two unmistakable cell types

  1. Outer Trophoblast cells
  2. Embryoblast

Outer Trophoblast Cells – These will become the placenta, your baby’s lifeline during his stay in your uterine cocoon.

Embryoblast – This is the inner cell mass that will develop into your baby after 9 months.

i. Is it a Boy or a Girl?

Well, it’s not at all possible to tell in the first month of pregnancy that it will be a baby boy or a girl but yes it’s gender has been already decided by the upcoming dad. Surprised? Want to know how?

baby covered by towel

Gender is directly determined by the chromosomes. Mom always supplies an X chromosome but the father supplies either X and Y chromosome. Two X result in different and XY results differently.

Let’s understand with the help of table


Within a few months, you will find out which pair has actually won and grown inside of you.

4. 4th Week of Pregnancy

This fourth week of the 1st month of pregnancy is now the implantation week. Your baby, which is still very small in size, has completed its almost 7 days travel down your fallopian tube.

It has claimed its confirmed berth in your uterus by tunneling into the tenacious uterine covering.

Settled in your uterine home, this little wonder has set up the comfortable association that will tie you two for the following eight or more months and everlastingly after.

i. Pregnancy Positive Officially

This week the main work which your body is doing is building the amniotic sac that your baby will call its home. 

The little embryo will start to produce HCG (Human chorionic gonadotropin). The presence of this HCG hormone will turn your pregnancy test positive. Sometimes it takes a week more to produce enough quantity to get noticed on the test.

embryo division

The embryo is still a tiny dot 0.04 inches long and weighs only 0.04OZ but it has already started to differentiate into three layers.

a. Endoderm

It will become the Liver, Pancreas, the digestive system, thyroid gland and the bladder of the baby.

b. Mesoderm –

It will become the heart, Bones, Muscles, Blood vessels and the kidneys.

c. Ectoderm

This final layer which is the outer layer will become the skin, hair, nervous system, eyes and the main important part of your baby body Brain.

How beautiful the process is? Imagine. By the end of this first month of pregnancy, all the parts of your baby structure will be in the right place. In Other words, your baby is now fully formed to grow for the next few months.

This marks the end of the 1st month of pregnancy.

ii. Pregnancy Symptoms Week 3 and 4

a. Abdominal Pressure

You will feel a little bit pressure on your abdominal from now on. It is completely normal. Uterus lining is thickening, embryo plantation and a lot more things are going on in your body due to which you will feel some cramps.

b. Taste Changes

You will feel like you are tasting something metallic. It is just a side effect of pregnancy and it is very very common. Your body will love to eat something spicy.

5. Conclusion

In this blog, you get to know what changes happen inside you during the first month of pregnancy still when you don’t know that you are pregnant.

You get to know how the egg meets the sperm, how the fertilization occurs. keys of the ovulation process and how it is decided the baby will be a boy or a girl.

More exciting things will happen in the upcoming weeks. Be Confident and Don’t worry at all.

Check other Blogs-

2nd Month Pregnancy | Baby Growth Week by Week

3rd Month Pregnancy | Baby Growth Week by Week

4th Month Pregnancy | Baby Growth Week by Week

6. FAQ

Can I travel in the 1st month of pregnancy?

Yes, you can easily travel in your first month as there are clearly no outer symptoms in your body in the initial phase.

How to calculate the 1st month of pregnancy?

It is your doctor’s job to calculate the first month by calculating days from the last menstrual period.

What to eat in the 1st month of pregnancy?

Actually you don’t know that you are pregnant in the first month. So, you eat whatever you like. Otherwise, you should always eat a fibre-rich diet.

Can you have a period in the first month of pregnancy?

No, because this is the main indication that you are pregnant when you miss a period.

Can I drink alcohol when I am the first month pregnant?

Alcohol is always harmful and its effect doubles when you are pregnant. Completely avoid it.

Author: Gynomart

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