Even if you take a lot of birth control pills, there is still a possibility of pregnancy, mainly because the contraceptive mechanism of birth control pills is to inhibit ovulation of the ovaries, or it can cause changes in the thickness of the endometrium, which prevents the fertilized egg from being laid. After stopping the pill, the ovaries will usually resume ovulation in 2-3 months and the endometrium will return to its normal thickness, which will not affect pregnancy. If you are planning to get pregnant, if you are taking the emergency contraceptive pill, it is best to stop taking the pill for 3 months before considering pregnancy. If you are taking short-acting contraceptives, it is advisable to consider pregnancy six months after stopping the pill, which is more conducive to eugenics, and to take folic acid tablets before planning a pregnancy.