To determine whether there is menstrual blood or pregnancy bleeding, you can use early pregnancy test, urine pregnancy test and blood HCG test. 1. Early pregnancy test: a kind of test paper that can initially detect whether you are pregnant or not, if the test result is positive, it may be pregnancy bleeding; on the contrary, it is menstrual blood. 2. Urine pregnancy test: refers to the condition of determining whether a woman is pregnant or not by detecting whether a certain amount of HCG (human chorionic gonadotropin) is present in human urine. If the urine pregnancy test is positive, then she is pregnant; on the contrary, she may have menstrual blood and is not pregnant. 3. Blood HCG test: The HCG level in the blood serum can also determine whether the body is pregnant, so as to determine whether it is menstrual blood or pregnancy bleeding. It can also provide clinical basis for early pregnancy diagnosis, ectopic pregnancy and incomplete abortion. If you encounter any of the above problems, it is recommended to promptly find out whether you are pregnant or not, and then undergo further examination.