Pregnancy can be detected late in some people due to long menstrual cycles, late ovulation and late fertilization of the egg. In women with regular menstrual cycles, pregnancy is usually confirmed by an HCG (human chorionic gonadotropin) test about 10 days after intercourse. However, when the menstrual cycle is long, ovulation occurs late, and the fertilized egg will also be late in implanting, so some people will detect pregnancy later, but this is normal and can be tested under the guidance of a doctor. Whether the pregnancy is confirmed by blood HCG test or urine pregnancy test, ultrasonography is needed at about 6 weeks after menopause to confirm normal intrauterine pregnancy and check the gestational week according to the size of the gestational sac or embryo. When the gestational sac is small or there is no fetal bud or heartbeat, it is necessary to repeat the test according to the length of the menstrual cycle, combined with the progesterone and blood HCG levels, and in accordance with the doctor’s instructions.