First week of pregnancy

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Marie-Ange Demory
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In this article

  • First week of pregnancy
  • How is the onset of pregnancy determined?
  • Symptoms of pregnancy
  • The fetus in the first week of pregnancy

First week of pregnancy

The first week of pregnancy is always a period that is considered "a posteriori" since, in fact, no woman notices that conception has taken place. In fact, not only did it reveal itself any symptoms (nor will it manifest itself for some time yet), but there has not yet been a delay in the menstrual cycle, which usually represents the first sign of a possible pregnancy.





Read also: First weeks of pregnancy: symptoms, dos and don'ts

How is the onset of pregnancy determined?

But if the future mother is totally unaware of the fact that her egg has been fertilized how do you go back to the first week of pregnancy?



Normally, once the pregnancy is ascertained, the convention is used according to which it is considered - with an approximation of about two weeks - the date of your last menstruation. From that day, adding 40 weeks to the calculation, we will have the presumed period of delivery.

So in the first week of pregnancy, you haven't ovulated yet, but - conventionally - it's the first week of your period.

Read also: How to calculate the date of birth with the lunar calendar

Symptoms of pregnancy

You're considering the first week of pregnancy like that of conception and you want to know what's going on in your body? You are already in the third week actually.



Symptoms of a pregnancy

Although no noticeable change is evident in the first few weeks, pregnancy remains a long and demanding journey, in which the female body is subjected to stress, hormonal changes e physical transformations that will affect the future mother's daily life for months (just think of the baby bump, which will grow out of all proportion).

Added to this is the fact that the symptomatology of the pregnant state remains very subjective: some women begin to feel changes already in the first weeks, while others do not notice anything for months (and some even manage to carry out a pregnancy practically without symptoms. ).

But what will be the first symptoms of pregnancy then? Obviously, as already specified, we will start from lack of a menstrual cycle, an episode that will pave the way for many other physiological signals:

  • Small blood loss.
  • More sensitive breasts.
  • Increased sensitivity to odors (and sometimes tastes)
  • Urges to pee
  • Fatigue
  • Morning sickness but it can happen throughout the day
  • Hard and swollen belly
  • Lower belly tension
Read also: How to recognize pregnancy nausea

The fetus in the first week of pregnancy

In the first week of pregnancy (we are still calling it earlier, but you are actually in the third week) it is still early to talk about a fetus, as the egg has just been fertilized. In this very early stage of gestation, therefore, the protagonist is the embryo or even better the morula, an aggregate of cells that represents the first stage of hormonal development.

After fertilization by the spermatozoon in fact, the cell obtained - lo zigote - begins to divide and creates the morula which begins to move from the ovary to the uterus passing through fallopian tubes. When thenesting will be completed (usually within the end of the week), the cluster of cells will continue its replicative operation, until it becomes a real embryo and, finally, a fetus.

FONTI: NHS

Read also: How conception occurs

Questions and answers

How to tell if you are pregnant in the first week of pregnancy?

It is very difficult to notice your interesting state in the first week. The most frequent symptoms, however, are stiff stomach, morning sickness and, above all, lack of menstruation.

When do you feel the first symptoms of pregnancy? 

It is subjective. Some women experience symptoms in the first few weeks, while for others nothing happens for months.

Read also: First month of pregnancy: everything you need to know

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