Women also need to undergo multiple prenatal examinations during early pregnancy, some of which are targeted, such as gestational sac blood flow signal testing, to determine whether early gestational sac development is at a normal level. So, when does the gestational sac have blood flow signals?
1. In the first 30-40 days of pregnancy, the fertilized egg will gradually form a gestational sac, and the first embryo will appear 40-50 days later. When the pregnancy enters 50-60 days, the fetal heart will form. However, due to differences in the length of a woman's menstrual cycle and individual factors, there may be variations in the development of the gestational sac after pregnancy, so the timing of fetal heart rate and fetal bud appearance after pregnancy is not entirely the same.
2. Most women can find fetal heart and fetal buds in the gestational sac around 50 days after pregnancy, and blood flow signals can also be detected in the fetal heart and buds during examination. This indicates that the initial embryonic tissue after pregnancy is at a normal level of development. If no fetal heart or fetal bud is detected after more than 60 days of pregnancy, one should be alert to the possibility of an empty sac pregnancy.
3. In addition, women should undergo prenatal examinations in the early stages of pregnancy. Some pregnant women may have blood flow signals around the gestational sac, manifested as visible dotted blood flow signals. This situation should be considered to be related to threatened miscarriage. Therefore, the results of such tests should be further combined with blood HCG and progesterone testing to rule out the possibility of this cause.
