If the volume, time and color of menstruation from this period to the next period are normal, and there has been no sexual intercourse between periods, it is impossible to get pregnant in this case. The primary condition for pregnancy is the union of sperm and egg. If there is no intercourse, the sperm does not enter the woman’s body and it is impossible to form a fertilized egg, so it is impossible to get pregnant. If you are pregnant, it is possible that the last time you had sex during ovulation, which led to pregnancy, and the vaginal bleeding this time is not menstruation at all, but abnormal vaginal bleeding, which may be clinically a pre-eclampsia miscarriage or other causes of bleeding. It is recommended to know the size of the gestational sac through ultrasound examination, so that you can calculate the exact time of pregnancy and know whether you are pregnant last time or when you are pregnant .