Picture of embryo in gestational sac

After a woman becomes pregnant, she must pay attention to the growth and development of the test tube embryo and go to the hospital for examination on time. Generally, an ultrasound examination is required in the early stages of pregnancy to observe the condition of the gestational sac and to understand whether the embryo and fetal heartbeat are present. So, when will the fetal bud and fetal heartbeat appear in the gestational sac?

After a woman becomes pregnant, the gestational sac usually forms at 30-40 days, the embryo bud forms at 40-50 days of pregnancy, and the fetal heartbeat appears at 50-60 days of pregnancy. Pregnant women can have an ultrasound examination at 50 days of pregnancy, at which time they can basically detect the embryo and fetal heartbeat.

If after examination, no embryonic bud and fetal heartbeat are found, pregnant women should not worry. You can wait about a week and go to the hospital for a follow-up visit. Many pregnant women can find embryonic bud and fetal heartbeat. This is because some women have irregular menstrual cycles and late ovulation, which will result in the late appearance of the gestational sac, fetal bud and fetal heartbeat after the woman becomes pregnant.

Although the embryo bud and fetal heartbeat may appear with a delay, if the embryo bud and fetal heartbeat cannot be found during examination at 60 days of pregnancy, it can be diagnosed as embryonic arrest. If the test tube embryo is not discharged on its own, the woman needs to undergo abortion immediately. If the dead fetus stays in the uterus for too long, it is very easy to cause intrauterine infection.

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35 days fetal sac photo

The duration of pregnancy is counted from the first day of the expected date of delivery. At the 35th day of pregnancy, which is five weeks of pregnancy, a small gestational sac can be seen through B-ultrasound. The gestational sac occupies less than 1/4 of the uterine cavity and should be about 3-5mm in size. In some cases, the embryonic bud and fetal heartbeat can be seen.

However, some women become pregnant relatively late, and the gestational sac cannot be seen by B-ultrasound until 35 days.

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40 days of pregnancy

At 40 days of pregnancy, the gestational sac is approximately 1.5 to 1.5 cm. However, different pregnant women have different pregnancy periods, so the size of the gestational sac will also be different.

A normal gestational sac should be a ring-shaped or oval cystic echo with thick walls and good support. After 42 days of pregnancy, the fetal bud, fetal heart growth and regular primitive heart beats can be seen in the fetal sac. If there is no fetal bud, fetal heart growth, or primitive heart beat in the uterine cavity after 49 days of pregnancy, it indicates that the embryonic development is abnormal.

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The relationship between the gestational sac and the number of weeks of pregnancy

Based on the fetal sac, the gestational age, gestational age and delivery date can be calculated.

4 weeks: The fetus is only 0.2 cm. The amniotic cavity is formed just after the sperm and egg combine and the embryo implants, and its volume is not large. Ultrasound cannot clearly show signs of pregnancy.

5 weeks: The fetus grows to 0.4 cm and enters the test tube embryo stage. The amniotic cavity expands, initial cardiovascular and cerebrovascular diseases appear, and heart beats may be present. B-ultrasound can show a small gestational sac, which occupies less than 1/4 of the uterine cavity, or the embryonic bud and fetal heartbeat can be seen from it.

6 weeks: The baby grows to 0.85 cm, the head, brain alveoli, frontal organs, respiratory, digestive, and nervous organs of the baby are divided, the gestational sac is clearly visible on B-ultrasound, and the fetal bud, fetal heart rate and fetal heart rate are seen.

7 weeks: The fetus grows to 1.33 cm. The test tube embryo has a human prototype. The body segments have all been divided, the limbs have separated, and the various systems are further developing. B-ultrasound clearly shows the embryo, fetal heart rate and fetal heart rate. The gestational sac occupies about 1/3 of the uterine cavity.

8 weeks: The fetus grows to 1.66 cm, the fetal shape is fixed, the fetal head, body and limbs can be separated, and the fetal head is larger than the body. B-ultrasound shows that the gestational sac occupies about 1/2 of the vagina, the shape of the fetus and the fetal movement are clearly visible, and the yolk sac can be seen.