How many days before the menstrual period is the safe period

After having sex, if you take birth control pills, the contraceptive effect can be achieved to a certain extent, but long-term use will also cause side effects. Therefore, the safest and most effective way to prevent pregnancy is to avoid ovulation and have sex during the safe period. Many girls have heard of the safe period of menstruation. The chance of pregnancy will be affected to a certain extent during this period of time and thus reduced. So how should girls calculate their normal safe period of menstruation?

How many days before menstruation is the safe period?

For women with relatively regular menstruation, whose cycle is about 28 days, eight days after the first menstruation and seven days before menstruation are considered safe menstruation. There are two types of safe menstruation period, one is the safe menstruation period before ovulation, and the other is the safe menstruation period after ovulation. And the safe menstruation period after ovulation is safer than the safe menstruation period before ovulation, but this kind of safety is not certain, because a woman's ovulation period may be affected by the environment and her mentality.

What are the dangerous periods of pregnancy?

Since there is a safe period of menstruation, then the corresponding is the dangerous period of pregnancy. In fact, the dangerous period of pregnancy is what we often call ovulation period. If a woman's menstruation is relatively regular, then the ovulation period is two weeks before the next menstruation, that is, the first fourteen days. To be on the safe side, we usually call the five days before ovulation and the four days after ovulation, these ten days, the ovulation period. During this period of ovulation, women are very easy to get pregnant, so if you want to have a baby, you can have sex in the next few days, and the probability of success is very high.

The definitions of the safe period of menstruation and the dangerous period of pregnancy are completely different, but the timings are easy to mistake. We must distinguish the timings of the two to ensure that we can have children if we want to, and take contraceptive measures if we want to.

Is safe period contraception reliable?

The rhythm method of contraception is actually not safe, because the rhythm method of contraception needs to calculate the ovulation period based on the menstrual cycle, and due to various factors, women's ovulation period may be affected. The safe period contraceptive method calculates the ovulation period based on the menstrual cycle and is suitable for women with regular menstrual cycles. However, women may experience additional ovulation due to their mentality, environment, health, sexual life and other conditions, and the time of ovulation in women is affected by factors such as the external environment, climate, their own mentality, and health status, resulting in delayed or premature ovulation.

In addition, there is no accurate conclusion on the maximum survival time of sperm and eggs in the female reproductive system at present. Therefore, the safe menstruation period cannot be calculated accurately. Therefore, it is possible to get pregnant during the safe menstruation period even if contraception is not safe. It is recommended that if women are not prepared for pregnancy, it is best to choose a more appropriate contraceptive method based on their own situation.