It is possible to get pregnant after having intercourse once, but it is not certain that you will get pregnant after having intercourse once. Women only have the chance to ovulate once a month. If both men and women are healthy and want to get pregnant after having intercourse once, they can choose to have intercourse during their ovulation period to increase their chances of getting pregnant. Ovulation is usually about 14 days before the next menstrual period, and the newly ovulated egg is more energetic and of better quality, so it can easily combine with sperm to form a fertilized egg. The male sperm can survive in the body for 2-3 days after entering the woman’s body, and the discharged egg can also survive in the body for about 2 days, and then the sperm and egg will gradually decrease in activity over time. The couple needs to relax and avoid mental tension when having intercourse. After the male ejaculation, the woman should lie on her back for 15-30 minutes and also put her buttocks up to promote the smooth entry of sperm into the fallopian tube to meet and unite with the egg. In addition, if you need to get pregnant, you need to undergo a pregnancy checkup to understand the health status of both spouses and if abnormalities are found, you need to solve the abnormalities in time before starting to prepare for pregnancy. Women need to take folic acid to prevent fetal neural tube abnormalities, exercise properly, and maintain a balanced nutrition and a peaceful mind.