The development of the fetus is a miraculous process. In order to understand their development, pregnant women will regularly go to the hospital for prenatal check ups. At the beginning, the fetus has not yet formed, and only the gestational sac can be seen through ultrasound, which is not very large. However, how long does it take for the yolk sac to appear in the dark area?
If there is a yolk sac in the dark zone for 35 days, the fetal heart and embryo may not be visible. Sometimes, it can only be seen after 6-7 weeks of amenorrhea. If the menstrual cycle is delayed for more than a week and the urine test confirms pregnancy, the embryo buds should be observed around 42 days. If there is no fetal heart or embryo buds for more than two months, this is an abnormal situation, which is likely due to fetal arrest or abnormal embryo development.
The appearance of yolk sac is mostly in the early stages of pregnancy. In order to ensure the health of the fetus, sexual intercourse should be avoided during the first 3 months of pregnancy, otherwise it may cause uterine contractions, leading to miscarriage. If there is abnormal vaginal bleeding or sudden abdominal pain, pregnant women should seek medical examination. As the gestational age increases, the yolk sac will also continue to develop and change.
When the gestational sac reaches 1 centimeter, the fetal heart rate can be seen. Pregnant women should not be too anxious. The time when the fetal heart rate and fetal bud appear varies from person to person. If the fertilized egg implants later or the menstrual period is irregular, the fetal heart rate and fetal bud may not appear so quickly. If they have not appeared during the examination, they can wait for a week to check again as long as they can appear normally in the later stage. However, do not do the examination too early, as it may harm the fetus.
