For women with regular menstrual cycles, calculating the due date and the time of pregnancy can both be calculated through menstruation. However, for women with irregular menstruation, calculating the due date and pregnancy time based on menstruation may be a bit inaccurate. How to calculate the pregnancy time for menstrual disorders?
If it is a menstrual disorder, the pregnancy time can be determined based on the ovulation time, which is the ovulation day plus 14 days. If you cannot determine the ovulation date, you can check the size of the gestational sac during the first ultrasound to determine. Generally speaking, the average diameter of the gestational sac plus 30 days is the number of days of pregnancy. In addition to judging by the gestational sac, it can also be judged by the fetal heart and fetal bud, and the length of the fetal heart and bud can be determined by adding 6.5, which is the number of weeks of pregnancy.
In terms of menstrual regularity, the time of pregnancy is calculated from the first day of the last menstrual period, not from the time of intercourse. Because the average menstrual cycle for women should be 28 days, if calculated from the first day of the last menstrual cycle, it means that childbirth is 280 days after the last menstrual cycle. This does not mean that it cannot be calculated from the time of intercourse, but rather that it is more accurate to calculate from the last menstrual cycle.
There is a certain gap between the actual time of conception and the last menstrual period. Generally speaking, for women with regular menstrual cycles, the difference between the time of conception and the calculated time of pregnancy is about 15 days at around 30 days.
