The success rate of contraception is generally around 90%. 2. If a woman is within 4 days of her period or within 3-4 days of her period, no contraceptive measures are taken after sex, as the eggs are not discharged during this period. It is possible to observe temporarily. If a woman has a normal sex life and is of childbearing age, it is best to use contraceptive measures such as penis condoms or intrauterine devices, which are safer and will not have a negative impact on a woman’s body. Otherwise, if a woman has frequent unwanted pregnancies, it is easy to cause thin endometrium and endocrine disorders, which will have a greater negative impact on the body.