Married or unmarried women of childbearing age who are sexually active should be aware of pregnancy if any of the following occurs: 1. regular menstruation, but after the time when menstruation should come and did not come; 2. irregular menstruation, nausea, vomiting, poor appetite, sleepiness, general weakness, breast swelling and pain and other discomforts; 3. a small amount of vaginal bleeding, which does not look like menstruation, lasts for a long time, and sometimes has pain in the lower abdomen.