When does pregnancy start counting time?

The calculation of a woman's pregnancy time is generally based on her last menstruation, that is, the first day of her last menstruation is the first day of pregnancy.

The duration of a woman's normal pregnancy is about 265 days, which should be counted from the day when the egg is fertilized. However, because the ovulation period and fertilization time of each woman are uncertain, it is not accurate to the specific day. For women with regular menstruation, the expected date of delivery is calculated from the first day of the last menstrual period, which is reduced by 3 or 9 days in the current month and increased by 7 days. If it is the lunar calendar, it is increased by 15, and the total number of days is 280 days, that is, 40 weeks.

For women with extremely irregular menstruation, the last menstrual calculation method cannot be used without ovulation detection. At this time, the calculation method of B-ultrasound can scientifically calculate the gestational age and expected date of delivery.

Prenatal symptoms

1, 1 ~ Two days before labor, a small amount of bloody mucus will flow out of the vagina, which is often called seeing red. This is because for uterine contraction, the baby's head begins to sink into the basin, and the fetal membrane and the uterine wall gradually separate and rub, which will lead to blood vessel rupture and bleeding. Red or brown viscous liquid, or bloodshot in secretion.

Generally, red appears 1 ~ 2 days before delivery, but there are great differences among individuals, and some red days or even a week after delivery, so we should pay more attention to its shape, color and quantity before making a judgment.

2, labor pains, several times a day, lasting about 30 seconds, with the approach of labor, the interval of labor pains is getting shorter and shorter, if every 10 ~ 15 minutes 1 time, you should be hospitalized immediately, and if there is water breakthrough, you should lie flat.

3. When water is cut off, pregnant women will feel that hot liquid is constantly flowing out of the vagina and can't control it. The liquid is colorless and transparent because the uterus contracts strongly, the pressure in the uterine cavity increases gradually, the cervix is wide open, and the head drops, causing the fetal membrane to rupture and amniotic fluid to flow out of the vagina. At this time, it is not far from birth. Pregnant women must lie flat after breaking water.