Generally sperm can survive in the uterus for up to 72 hours, depending on the condition of the uterine lining and individual differences. Sperm can survive for a long time in a cold environment and can even be stored for a long time. This factor needs to be taken into account if safe period contraception is chosen. Follicles can survive up to 24 hours after ovulation, and there is still a risk of pregnancy 3-5 days before ovulation, so it is advisable to take measures and use condoms to avoid pregnancy. If you are preparing for pregnancy, you can increase your chances of getting pregnant by having intercourse once every other day 5 days before and 4 days after ovulation. It is recommended to abstain from sex for 1 week before intercourse to ensure that the sperm quality is intact. Usually pay attention to rest, eat a light diet, avoid sedentary, hold urine, tobacco and alcohol stimulation, appropriate activities and exercise, enhance physical fitness.