If you have sex at the time of ovulation and are fertilized and pregnant, you can check your blood for chorionic gonadotropin (HCG) on the 7th day after ovulation and it will rise, doubling every 1.7-2 days. At 30 days of pregnancy, HCG over 100miu/ml is the normal range. It is also necessary to check progesterone, which at this time should normally exceed 25ng/ml. if it appears to be lower, it needs to be rechecked because progesterone production is pulsatile, sometimes high, sometimes low, and if it is below 6ng/ml, the pregnancy will not be successful.