To determine whether you are about to have your period or are pregnant, use the time of intercourse, physical symptoms, and laboratory tests. 1. time of coitus: a woman’s last menstrual period to this menstrual period have not coitus, women generally have a normal menstrual period will not be pregnant, two menstrual period in the middle of the coitus, coitus will be delayed for more than 7 days after the menstrual period does not come, to be considered as the possibility of pregnancy is greater. 2. Physical symptoms: each woman’s physical condition is different, the performance of the symptoms are also different, some women have no abnormal feeling before the onset of menstruation or at the beginning of pregnancy, this situation is more difficult to determine is menstruation or pregnancy. Some women will have lower abdominal pain and lumbago before menstruation, and then have vaginal bleeding, the amount and duration of vaginal bleeding is similar to that of normal menstruation, which is considered to be the onset of menstruation, but this is not absolute, and the possibility of pregnancy cannot be ruled out. 3. Laboratory tests: Laboratory tests, such as blood HCG (human chorionic gonadotropin), urine pregnancy test, abdominal ultrasound or vaginal ultrasound, can be used to accurately determine whether a woman is menstruating or pregnant. Women who want to know whether they are pregnant or not are advised to go to a regular hospital for examination and judgment.