Most women can test for pregnancy by taking a blood test for human chorionic gonadotropin levels if their period is two days late. Most women have regular periods and if they have intercourse during ovulation, the chances of conception are high. Therefore, most women are able to detect pregnancy by taking a blood test two days after menopause. Because during ovulation, usually 8-10 days after intercourse, the fertilized egg will be able to implant, and the body secretes human chorionic gonadotropin, so a blood test for HCG can detect pregnancy. Women should have regular blood tests after menopause to understand the development of the embryo through changes in blood values.