It is also possible to get pregnant three days before ovulation. Women who have regular periods can use their periods to predict ovulation. However, there is also a chance of pregnancy if you do not have intercourse during ovulation. Ovulation is easily affected by emotions, external environmental changes, lifestyle changes, etc. Ovulation may be early this time, then the ovulation date based on previous menstruation is inaccurate, and you may get pregnant unexpectedly. Clinically, if a woman does not intend to get pregnant, she needs to do a good job of contraception when having sex, and it is easy to avoid the ovulation period for contraception to fail. The more effective contraceptive methods are oral contraceptive pills, intrauterine devices, condoms and other methods. You can choose flexibly according to your own situation to avoid unwanted pregnancy.