After sperm and egg meet and combine, a fertilized egg is formed. When the fertilized egg successfully implants in the uterus, a woman's pregnancy begins smoothly. Embryo development is a continuous process, and when the fertilized egg develops to a certain extent, it forms a embryo, which then develops into a fetus. However, what is a pregnant embryo?
The gestational embryo is the size of the embryo. For normal intrauterine pregnancy, B-ultrasound examination usually shows the gestational embryo and fetal heart tube pulsation at 6-7 weeks of pregnancy. If there is still no gestational embryo or fetal heart after seven weeks, women should go to the hospital for examination in a timely manner to be alert to the embryo stopping development.
In general, a gestational sac is formed at 30-40 days of pregnancy, a fetal bud is formed at 40-50 days of pregnancy, and a fetal heart is formed at 50-60 days of pregnancy. At 40 days of pregnancy, fetal sprouts can be seen, which are still very small, about 0.5-1 centimeter in size and shaped like small seahorses.
However, for some women with irregular menstrual cycles, late ovulation, or late implantation of fertilized eggs, the time for the appearance of fetal buds and heartbeats may be relatively delayed. Therefore, women can postpone their follow-up visit to the hospital for a week. If there are still no fetal buds, it may be due to fetal arrest, mainly caused by chromosomal abnormalities or exposure to toxic substances.
