Having a normal menstrual period after intercourse means that there is no pregnancy. This is because after the formation of sperm and egg, hormonal changes occur in the body that cause menopause. So one necessary condition for diagnosing early pregnancy is having a history of menopause. To know whether you are pregnant or not, you can observe the following aspects: First, there is no history of menopause. A woman’s normal menstrual cycle is 21-35 days, the average is 28 days, if in the menopause more than a week, it is likely to be pregnant. Second, there is no early pregnancy reaction. Early pregnancy reaction contains many kinds, everyone’s early pregnancy reaction is different, most people can have dizziness, fatigue, drowsiness, poor appetite, nausea, vomiting, anorexia greasy, and some pregnant women can have mood changes after pregnancy. The above two aspects can be observed by oneself, the preliminary inference of whether the pregnancy, the most accurate or urine pregnancy test or blood HCG test.