How to calculate the safety period

Women's ovulation date is generally around 14 days before the next menstruation. The ovulation date is calculated from 1 day of the next menstrual period, and from the countdown to 14 day or negative 14 day. The ovulation date, the first 5 days and the last 4 days are called ovulation period together. For example, anonymous's menstrual cycle is 28 days, and the 1 day of this menstrual cramp is 65438+February 2nd, so the next menstrual cramp is 65438+February 30th (65438+February 2nd plus 28 days), and then subtract14th day from 65438+February 30th, then Ovulation day, the first 5 days and the last 4 days, that is, 65438+February 1 1-20, is the ovulation period. Except the menstrual period and ovulation period, the rest of the time is a safe period. You don't have to use any birth control pills and birth control pills during safe sexual intercourse.

Let me give you an example: Your girlfriend menstruates on the 9th of this month, which usually lasts for 4-5 days. In other words, 9- 14 is the menstrual period, so it is best not to have sex. If it is unsanitary, it is easy to have massive bleeding. The menstrual cycle of girls is generally 28 days (25-3 1 is normal for different people), and the next month's menstruation should be April 6 (because March is 3 1 day). Counting forward 14 days, that is, March 23, the first 5 days and the last 4 days of the 23rd are the ovulation period (66. The rest of the days (March1May-March 17, March 27th-April 5th) are safe. Generally, half the days in a month are safe, but be sure that it is not good for your girlfriend to take medicine all the time! ! !

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