Having intercourse a week apart after your period does not usually allow you to deduce which intercourse is pregnant. A week or so after the menstrual period is the time of ovulation, and if you have unprotected sex, you can get pregnant. Having intercourse a week apart, a relatively short interval, generally does not allow you to project which intercourse resulted in pregnancy. After menopause, you can use a pregnancy test stick or pregnancy test paper to test for human chorionic gonadotropin in the urine about 7 to 10 days after menopause, or go to the hospital for a blood human chorionic gonadotropin test, blood progesterone test, pelvic ultrasound, etc., most of which can make a clear diagnosis of pregnancy, but it is not possible to judge to determine which coitus caused the pregnancy.