Pregnancy can be detected around 30 days or so after menopause. You can detect if you are pregnant by testing your morning urine with a pregnancy test stick or pregnancy test paper, and you can also determine if you are pregnant by the cessation of menstruation and early pregnancy reaction. It takes only a few days for the fertilized egg to form and implant. Once the egg has successfully implanted, the HCG in the body will change. Blood HCG is more sensitive, and after the fertilized egg has implanted, you can take a blood test for HCG, and if it is elevated, it suggests pregnancy. In order to rule out ectopic pregnancy, about 6 weeks after menopause can be carried out ultrasound examination to determine whether intrauterine pregnancy. Due to the different physical condition of each pregnant woman, some people may not be able to see the pregnancy sac on ultrasound after 6 weeks of menopause after ovulation. At this point, it is necessary to monitor the blood HCG to see how well it is doubling. If the doubling is good, then wait for some time to review the ultrasound. If you have regular periods, you can find out if you are pregnant in a month or so by checking your HCG.