Is it normal to not see the embryo or fetal heartbeat at 56 days of pregnancy?

The embryonic bud and fetal heart refer to the first half month during the development stage of sperm and egg combination, which is called the pregnant egg. After that, various organs are gradually formed. Before 8 weeks of pregnancy, it is called the embryo (or embryonic bud and fetal heart); the third to the first month and fourth week of pregnancy is called the embryonic bud and fetal heart period.

Due to the growth and development of the test tube embryo, a gestational sac is produced on day 30-40, a fetal bud and fetal heartbeat are produced on day 40-50, and a fetal heartbeat is produced on day 50-60. Therefore, an ultrasound should generally be done around day 60, at which time you can see whether the gestational sac, fetal bud and fetal heartbeat are normal.

Generation time

The period from the third month of pregnancy to the first four weeks of pregnancy is called the embryonic bud and fetal heart rate period. The embryonic bud and fetal heart are 0.5-1 cm in size and look like a small seahorse.

Fetal heart size

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

7 weeks: The fetus grows to 1.33 cm. The test tube embryo has a human prototype, the body segments have all divided, the limbs have separated, and the various systems have further developed. 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 settled, 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.

9 weeks: The fetus grows to 2.15 cm, the fetal head is larger than the embryo, the main manifestations of various parts are clearer, the head begins to thicken, and the embryo begins to grow. B-ultrasound shows that the gestational sac almost fills the uterine cavity, the outline of the fetus is clearer, and the embryo has begun to appear.