Which contraceptive method is the safest?

I got my period not long after I gave birth to my baby. Which contraceptive method is the safest? I'm afraid that if I get pregnant again, it will harm my body. A friend said that some people calculate their safe period every month, and having sex during the safe period will reduce the chance of pregnancy. If I take contraceptive measures, it will be safe. A friend asked me which contraceptive method is the safest and how to calculate the safe period, and I will tell you right away.

The healthiest options are condoms and IUDs. Any contraceptive has side effects, so currently only IUDs and condoms are available.

Normal women of childbearing age have menstruation every month. The period from the beginning of this menstruation to the first day of the next menstruation is called a menstrual cycle. Ovulation usually occurs about 14 days before the next menstrual period. The released egg can survive for about 24 hours. If fertilization cannot be completed, it will then degenerate and be absorbed by the human body.

After sperm enters the female reproductive tract, it can maintain its fertilizing ability for 1 to 3 days. Therefore, a woman is more likely to become pregnant if she has sex with a man from 3 days before to 1 day after ovulation. If either the sperm or the egg has lost its ability to fertilize when they meet, conception will not occur.

Medically, the 5 days before and 4 days after ovulation, together with the 10 days including the ovulation day, are classified as the female ovulation and pregnancy period. The safe period method refers to a contraceptive method that involves having sex during the non-ovulation period to avoid the risk of unplanned pregnancy. The key to this method is to accurately determine the ovulation day.

Some people may think that since the ovulation and pregnancy period can be predicted, contraception should be simple. In fact, many women have unexpected pregnancies just because they blindly believe in the safe period contraception method. The reason is that the ovulation day is not constant and it is difficult to judge accurately. The ovulation date is predictable for women with regular menstrual cycles, but impossible to predict for women with irregular menstrual cycles. Medical research has found that certain stimuli (such as sexual stimulation or mental excitement when a couple reunites after a long separation) can lead to early ovulation; or after ovulation, ovulation can occur twice in the same cycle due to stimulation from certain factors...

The above is an introduction to which contraceptive method is the safest and how to calculate the safe period for women that my friend told me. When I first learned about it, I also calculated my menstrual period according to the above method and used the IUD as a contraceptive method. Because I am a troublesome and careless person, I am always afraid of forgetting to bring condoms. It is still safer to wear an IUD and calculate the safe period.