It is possible to have intercourse before ovulation, but the chances of pregnancy are relatively high. If you have no immediate plans to have children, it is advisable to use contraception when having intercourse. With regular menstruation, ovulation occurs about 14 days before the next menstrual period. In general, the survival time of male sperm is 72 hours, while the survival time of female eggs is usually 24-48 hours. The highest conception rate is achieved when intercourse is carried out within 12 hours before ovulation. In addition, if you want to improve the fertilization rate, you can also have intercourse every other day during this period. However, it is necessary to judge according to the actual situation. Some women have irregular menstrual cycles and the calculated ovulation period is not accurate, so the accuracy of judging whether they can get pregnant by having intercourse according to the calculated ovulation period is low. If you don’t plan to have children, you should take contraceptive measures whenever you have intercourse. Contraceptive methods include external condoms and oral short-acting contraceptive pills, which have a relatively good contraceptive effect. However, it should be noted that contraceptive pills should be used under the guidance of a doctor to avoid the adverse consequences of improper use.