The pregnancy cycle refers to the period from conception to childbirth.Because each pregnant woman is difficult to accurately determine the time of conception, the medical expected due to the first day of the last menstrual period, the entire pregnancy period is 280 days, 40 weeks, and 10 pregnancy months (each pregnancy month is for each pregnancy.4 weeks).Pregnant women give birth at 37 to 42 weeks of pregnancy, all of which are full.

The prerequisite for the regular calculation due to the regular menstruation, starting from the first day of the pregnant mother’s last menstruation, it has been added for 40 weeks (280 days), and the date of date is the due date.

You can also use a simpler calculation method, such as subtracting 3 or plus 9 in the month of the first day of the last menstrual period, which is the month of the due date; the day of the first day of menstruation plus 7 is the date of the expected period.Last day, it was a complete date.

However, if IVF pregnancy is assisted, the menstrual cycle may not be so regular due to the interference of some drugs. If the cost -effective period will be calculated according to the conventional method.Therefore, IVF calculation periods are different from the regular calculation due date.

Generally speaking, the menstrual cycle is 28 days, so on the 14th day, it should be the ovulation period.The time to survive after the eggs was discharged for about 24 hours, which means that the formation of fertilized eggs was completed within 1-2 days after ovulation.

For IVFs, the day of egg retrieval must be taken at the same time for fertilization. It can be calculated for 14 days before the egg retrieval day, as the first day of the last menstruation, and the due date is calculated.

Another calculation method is that if the transplanted embryo is an ovarian embryo on the third day, the date of the transplants on this day is pushed forward for 17 days as the last menstruation.If the capsule is transplanted, it is equivalent to the fifth day of fertilization, and push the transplant date for 19 days forward, as the last menstrual period, and then calculate the due date according to the last menstrual period.

You can also determine the number of days of pregnancy through B -ultrasound. For example, 45 days of pregnancy B -ultrasound examination, 70 days of pregnancy B -ultrasound can also be based on the size of the pregnancy sac, the length of the head and hip, and the use of the calculation formula of the B -ultrasound.Based on this, the cost -effective period is also a more accurate method.

You can also calculate the due date according to the time of the fetal movement. Generally, the first mother (first child) due date = the date of the fetal movement + 22 weeks.The due date of the mother (above the second child) = date of the fetal movement + 24 weeks.

Of course, calculating the due date is only about a period of time. Because each female menstrual cycle varies, it is normal for the speculative due date and actual due date to 1 to 2 weeks.