How to distinguish pregnancy and menstruation

When pregnancy has a precursor to abortion, it will show a little vaginal bleeding, so it is necessary to distinguish between abnormal bleeding caused by pregnancy or bleeding caused by menstruation in the early stage. Generally, bleeding caused by pregnancy lags behind the time of the last menstruation, and the menstrual volume will be significantly reduced than usual. It mainly shows a small amount of drop-like bleeding. Menstruation, menstrual blood color of the blood is dark red, its amount is generally not much different from the usual menstruation, in the subsequent amount of time will gradually reduce, and then will be clean, and the usual menstruation is the same.