What is a holiday periodic table calculator? How to calculate the physiological cycle calculator?

1, extrapolating algorithm of menstrual cycle: Generally speaking, ovulation occurs before the next menstrual period 12 ~ 16 days, and sperm can survive in women for about 3 days, and eggs can survive 1 day. Therefore, pregnancy should be 9~ 19 days before the next menstrual cramp.

2. Under normal circumstances, women only ovulate one egg every month, the ovulated egg can survive 1 day, and the sperm can survive in women for about 3 days. Fertilization usually occurs within 24 hours after ovulation, and once it exceeds 2~3 days, it cannot be combined with the egg. Therefore, having sex 2~3 days before ovulation and 1~2 days after ovulation has a high probability of pregnancy, which can be called easy pregnancy or dangerous period.

3. Generally, the ovulation date of women is between 12 and 16 days before the next menstruation, that is, from 1 day of the next menstruation, from 12 to 16 days or negative 12 to/kloc-0. Except the menstrual period, the rest of the time is a safe period.

4. Safe period can be divided into pre-ovulation safe period and post-ovulation safe period. The safe period before ovulation is from the day when menstruation is clean to the day before ovulation begins. It is a safe period after ovulation from the first day after ovulation to the day before the next menstrual cramp. Relatively speaking, the safe period before ovulation is safer than the safe period after ovulation.