Generally, a pregnancy test can be used to detect pregnancy 35-40 days after menopause, provided that the menstrual cycle is regular (28 to 30 days). For women with irregular periods, a pregnancy test should be taken 12-15 days after sex. Pregnancy tests can only be detected when the human chorionic gonadotropin in the urine has risen to a certain level, so it is not advisable to test too early. However, it is possible to determine whether you are pregnant by taking a blood test for human chorionic gonadotropin about 10 days after having sex. An ultrasound can also be performed around 40 days after pregnancy to determine whether the pregnancy is present and whether the fetus is in the uterus. Since test strips may give false positives, it is necessary to consult a doctor for clarification just in case. In addition, it is important to note that the test is more accurate in the morning and should be taken in the middle of the urine.