There is no specific clinical figure for the probability of getting pregnant 70 hours before ovulation, and the chances of getting pregnant are generally higher when you have intercourse during ovulation. Usually, male sperm can survive in the female vagina for 24-72 hours, the follicle is discharged within 24 hours of fertilization ability is stronger, the egg is generally able to survive for 24-48 hours. After intercourse sperm will be in the female fallopian tube area waiting to meet with the egg, if the sperm wait 70 hours or the woman ovulation in advance, when the sperm and the egg meet, will form a fertilized egg, so 70 hours before ovulation pregnancy probability is still very high. It is recommended that couples during the preparation for pregnancy go to the hospital to do pre-pregnancy eugenics health checkups to assess whether the body is suitable for pregnancy; quit smoking and drinking, develop good habits, and don’t stay up late. Exercise in moderation to maintain good health, keep a happy mood, and avoid heavy physical labor. Women should start taking oral folic acid from 3 months before the planned pregnancy to prevent neural tube defects. If a woman’s menstruation is delayed for more than 7 days after intercourse, it is recommended that she consult a doctor in time, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and treat the symptoms.