The time difference between the last menstrual period and the actual pregnancy

The time difference between the last menstrual period and actual pregnancy needs to be considered according to each person's menstrual cycle. Women with regular and irregular menstrual cycles vary greatly.

1. Regular menstrual cycle: If the menstrual cycle is relatively regular, with a cycle of 28-30 days, the time difference between the last menstrual period and the actual pregnancy is usually 10-15 days, which is normal. Because ovulation occurs about 14 days before menstruation, if the sperm and egg combine to form a fertilized egg on the day of ovulation, it is about half a month away from the last menstrual period;

2. Menstrual cycle disorder: If the menstrual cycle is irregular or menstruation is disordered, the last menstrual period may be completely inconsistent with the actual pregnancy time, that is, the actual pregnancy period cannot be calculated based on the last menstrual period. At this time, the actual pregnancy period can be calculated based on early ultrasound and laboratory tests. In the later stage, color Doppler ultrasound will also be evaluated regularly to check whether the fetal indicators are in line with the gestational age. For pregnant women with inaccurate menstruation, the clinical examination of the fetal gestational age is based on the color Doppler ultrasound. The expected date of delivery can also be based on the expected date of delivery calculated by color Doppler ultrasound.