Week 4 of pregnancy

Fourth week of pregnancy. The most important:

You are in the fourth week of pregnancy. During this week the embryo will implant in your endometrium and begin to produce beta-hCG (which will make the pregnancy test positive).

Week 4 of pregnancy (Week 2 of pregnancy).

You may already begin to notice some of the early symptoms of pregnancy. If you feel morning sickness the infusion of ginger is useful to calm them down.

During this week you will have the first fault. Therefore, from this day is the ideal time to perform a pregnancy test. Remember: always in the morning and with the first urine.

If your pregnancy test has given you positive congratulations. It's a good time to start organizing, but calmly. If you go to your gynecologist to the first pregnancy review will go to the consultation of the midwife or matron, who will be who you control during the pregnancy.

As we knew in week 3 of pregnancy, ovulation tends to actually occur between the end of the second week and the beginning of the third, so if we take into account that the fertile period comprises from 3 days before the time of ovulation and 3 days later, most of the times conception occurs sometime during the third week of pregnancy (We should not confuse with the week of gestation, which will always be 15 days behind the pregnancy).

In this way, the fourth week of pregnancy is, in reality, the last week of the menstrual cycle, which means that is the week in which menstrual delay is likely to occur that can make you suspect about the possibility that you're pregnant.

During this week the embryo is implanted in the endometrium , which consists of the inner uterine lining. In fact, due to this implantation, it is possible that you have a slight bleeding, which is what medically occurs as implantation bleeding or implantation bleeding .

Pregnancy test at the fourth week

The development of the embryo in the fourth week of pregnancy

During this week and until implantation occurs the embryo is still a blastocyst , which means that it is still at an early stage, consisting of a complex cellular structure formed by around 200 cells.

However, it already has 2 well differentiated structures. On the one hand we find the internal cell mass (MCI), which is from which the baby itself will develop itself, and on the other hand known as trophoblast, from which the placenta will develop.

As we indicated, during this week the embryo implantation , which consists basically of the adhesion (or 'grip') of the embryo to the endometrium. It is a much more complex process than you think, and this allows you to receive both the oxygen and nutrients necessary for its development.

This implantation occurs around the seventh or eighth day of development of the embryo, and can last several days, which means that if we compare it with the regular 28-day menstrual cycle, it will take place around 7 to 10 days after Ovulation has occurred.

Embryo implanted in the endometrium

What changes and symptoms occur in women during week 4 of pregnancy?

During this week it is much more possible than the early symptoms of pregnancy be much more obvious, although The most common is to confuse them also with premenstrual symptoms , so in reality it is possible that you think that menstruation is about to arrive from one moment to another.

But when the symptoms appear, the most common are the following:

  • Tension in the breast and tenderness in the breasts.
  • Morning sickness (especially in the morning).
  • Retention of liquids and / or a lot of desire to urinate.
  • Greater tiredness and sleep.
  • Pain in the lower abdomen

Also, as we indicated at the beginning, it is possible that the implantation bleeding . However, we must take into account from the start that bleeding does not always appear , so that a woman may not see signs of implantation (such as mild bleeding), and yet be perfectly pregnant. Likewise, if the bleeding does not appear, this does not mean that the embryo has not been implanted correctly.

If it appears, it is basically a light bleeding, so light that sometimes it can even go unnoticed. In fact, at times it may be a simple unimportant stain.

Can I already have a pregnancy test?

We must bear in mind that we are in week 4 of pregnancy, and in the second of gestation, which means that the embryo is already more than a week old. It has already produced different changes in both its size and its structure, from being a cell that has been divided into many to become what it is at the moment. And, all this, during the path that he makes from the fallopian tubes to the uterus.

In this week the implantation of the embryo takes place, and from the moment in which the implantation is finished, the embryo begins to produce the hormone beta-hCG , so if you take a pregnancy test, it can be positive. What's more, at the end of this week there will be a menstrual delay that could make you suspect a possible pregnancy.

Pregnancy test

When is the best time to get a pregnancy test?

Regarding when is the best day and time to perform the typical pregnancy test that you can easily acquire in pharmacies, it is best to wait for the first day of absence, especially if you suspect that you may be pregnant.

That is, waiting for you a day after the time when the rule should have arrived, especially if your menstrual cycles tend to be regular. However, there are brands that even offer the possibility of performing the test a day before the day of the arrival of menstruation, or the same day, with a fairly high reliability (around 95-98%).

So, if you plan to take the pregnancy test, remember that the best time of the day to do it is always in the morning, picking up the first urine in the morning. This is because your body expels the hormone chorionic gonadotropin through urine, and during these hours tends to be more concentrated in the urine.

Doubts that may arise during the fourth week of pregnancy

Is it still early to perform the first ultrasound?

Although the pregnancy test has given you positive you must bear in mind that the gestation period -that is, the development of the embryo- is between 10 to 15 days shorter, so it is still early to see the embryo.

In any case, the visualization of the gestational sac could be possible, and due to the small size of the embryo, nothing could be seen inside. This can obviously lead to confusion and create nervousness and tension in mom and dad.

It could also be due to the existence of an anembryonic pregnancy ( empty egg ), so that it is still too early to confirm whether it is a confusion because the embryo is still too small, or because the pregnancy is going bad and the embryo has not developed.

Therefore, it is not advisable or advisable to perform an ultrasound ultrasound during the fourth week of pregnancy

With 4 weeks the pregnancy test can be negative?

During this week the implantation of the embryo takes place. So if we consider that the hormone beta-hCG begins to be generated from the moment the embryo is implanted in the endometrium, if it has been conceived but has not yet been implanted, it is possible that a false negative is produced.

This happens in most cases when the urine pregnancy test is performed very early: a few days before it is recommended (for example, before the day on which menstruation should theoretically take place).

Therefore, it is advisable to repeat the pregnancy test a few days later, if you continue late and menstruation evidently has not arrived.

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