How long does it take for the anechoic area to turn into a gestational sac

A normal ultrasound examination at 4-5 weeks of pregnancy can detect anechoic changes in the uterus. This is an early manifestation of the gestational sac. A clear gestational sac can be seen after about 5-7 days of pregnancy. The fetal heart bud can be seen at 6-7 weeks of pregnancy. However, if the pregnant woman shows vaginal bleeding and abdominal pain, the anechoic area in the uterus does not necessarily become a gestational sac. Therefore, after B-ultrasound found that there is no echo area in the uterus, blood HCG examination and progesterone examination are needed. According to the progesterone level of HCG, the situation in early pregnancy is further determined. As long as HCG is doubled within the normal range, the probability of general anechoic area becoming pregnant sac is very large. It is recommended to pay attention to rest in early pregnancy, prohibit sexual life, and take a certain dose of folic acid tablets orally every day to prevent fetal development defects.