There are many reasons for the low menstrual flow, and it can not be directly judged to have been pregnant, it may be the appearance of various symptoms such as menstrual disorders, the reasons are: First, if the menstruation has been delayed a few days, more than the normal menstrual time, just a small amount of bleeding symptoms, consider it is pregnant, it is recommended to go to the hospital in time to do blood tests or urine tests to determine whether you are pregnant. Secondly, if the menstruation appears not delayed or early, and the menstrual volume is relatively small, consider it to be irregular menstruation, it is suggested to observe the physical symptoms first, which can be treated with taking motherwort granules to promote the discharge of menstrual blood. If the amount of bleeding is still relatively small after taking the drug and does not increase, it is best to go to the hospital for a timely examination to see if there is uterine cold.