Does drinking too much make your period heavy?

It can: But that would mean drinking way too much. Alcohol does have effects of blood clotting, and also has potential hormonal effects that can alter the regularity and nature of menstrual periods. The safe limit of drinking for women is an average of one standard drink per day, no more than 7 drinks per week, and never more than 4 drinks on one occasion. If you are exceeding this, this is unsafe.