It is possible to detect pregnancy if your period is delayed for 4 days. Menstruation delayed 4 days, that is, 34 days after menopause, women ovulation time is fourteen days before the onset of menstruation, menstruation delayed the fourth day indicates that women have been ovulating for 18 days, at this time it is possible to get pregnant. It takes about five or six days for the sperm and egg to combine to form a fertilized egg, and 1-2 weeks after conception the placental syncytial trophoblast cells produce a large amount of human chorionic gonadotropin. Pregnancy can usually be detected 8-10 days after fertilization by taking a blood test for HCG (human chorionic gonadotropin) levels. Blood HCG is the earliest and most sensitive indicator of pregnancy. HCG will increase rapidly after the fertilized egg is deposited in the lining of the uterus, and will be found in the blood as early as about 6 days after fertilization. generally speaking, for women with a regular menstrual cycle and normal ovulation, a four-day delay in menstruation is sufficient to detect pregnancy. Therefore, if your period is delayed for four days, it is recommended that you go to the hospital to see a doctor and have your blood tested for HCG to determine whether you are pregnant or not.