Because bleeding in less than one month of pregnancy, the most common reasons are: 1. small amount of bleeding caused by little endometrial exfoliation during fertilization of the fertilized egg. 2. biochemical pregnancy may have occurred. 3. vaginal mucosa congestion, edema and capillary rupture bleeding due to increased levels of estrogen, progesterone and chorionic gonadotropin after pregnancy. If the chorionic gonadotropin level is elevated and doubles well every other day and the progesterone level is elevated more than 15ng/ml, observe temporarily first, if the doubling is not good and the progesterone level is low regular follow-up of HCG is needed, if the vaginal bleeding increases and the HCG progesterone level decreases a biochemical pregnancy may have occurred. In addition to this, you should also ensure rest, preferably not to engage in physical work, and to ensure comprehensive nutrition when pregnant, you can take folic acid and vitamin tablets in moderation, you need to consult your doctor before taking them, and do the relevant physical monitoring.