Is the first day after menstruation considered a safe period?

In fact, it is certain that the first day after menstruation is a safe period, because no mature eggs are released at this time. Having sex at this time, even without safety measures, will not result in pregnancy, but the influence of other factors cannot be ruled out.

1. The menstrual cycle of most women is generally about 28 days (of course there are individual differences). The growth of egg cells requires a certain process. Mature egg cells are discharged in the days between two menstruations (usually around the 14th day of menstruation). After discharge, mature egg cells are the most active and easiest to fertilize. Therefore, it is easiest to get pregnant on the 14th day (and the two days before and after the 14th day).

2. If the egg cell is fertilized on the 13th, 14th, 15th, and 16th days, then after the fertilized egg enters the uterus, the endometrium will thicken, the secretion of estrogen and progesterone will increase, and the blood supply will increase, which means pregnancy, and menstruation will not occur; if there is no fertilization, then the secretion of estrogen and progesterone will decrease, the blood supply to the uterine endothelium will decrease, necrosis will occur, and menstruation will occur.

3. Menstruation is a physiological law of women. To put it simply, if the egg combines with the sperm, the endometrium will thicken (of course it will not fall off, because if it falls off it is menstruation), providing a large amount of nutrition to facilitate the growth of the fetus. If the egg does not combine with the sperm, the endometrium will undergo "tissue cell necrosis", and a large amount of the endometrium will fall off, forming menstruation. This monthly "tissue cell necrosis" is very necessary. It allows the tissue cells of the endometrium to be renewed once a month, thus maintaining strong activity.

4. If no mature egg is released on the first day after menstruation, it is basically impossible to get pregnant.