If you have intercourse on the 15th day after your period and do not use contraception, there is a possibility of pregnancy. How many women have a menstrual cycle of 28 days, ovulation is about 14 days before the next menstrual period, and on the 15th day after menstruation, most women are in the period of ovulation, when the chances of pregnancy are higher. If you don’t use contraception, the possibility of pregnancy cannot be ruled out. If you are planning to get pregnant, you can use ovulation test paper to monitor ovulation and arrange intercourse around the day of ovulation. If there is no plan to get pregnant, you should take proper contraceptive measures to reduce the chances of pregnancy. For women whose periods are delayed for a week, they should be alert to the possibility of pregnancy, and can use early pregnancy tests or seek medical attention to draw blood tests, according to the body’s human chorionic gonadotropin levels, to be able to confirm whether or not they are pregnant. If you are not planning to get pregnant, you should choose appropriate contraceptive measures to avoid unwanted pregnancy.