The last few months I have been having two periods each month. I'm currently on birth control and have been for about 11 months, and I get my regular period on the placebos. But the last few months I get a second menstrual cycle two weeks after the placebos. The cycle is very light, barely staining my panties and really only noticeable when I wipe.

My older sister had pretty messed up periods after her 3rd child and ended up having quadruplets naturally, no fertility drugs. I have not had any children. What is the reasoning for 2 periods in a month? Is there something wrong or am I just doomed to have all of my children at once?