I have taken oral contraceptives a few different times in my life In total i have taken them for about a decade I have never had a menstrual cycle during the Inactive week of pills like is normal I always begin menstruating when I take the first pill of a new pack. I have extremely short and light periods on or off BCP if that matters When I was first prescribed oral contraceptives it was to regulate my cycle and i was not sexually active and still this was happening so pregnancy is not to blame, i have tried many different types of pills and my body reacts the same on all of them, I am currently on nikki. I have never gotten pregnant on the pill so they are effective even with the odd cycle ( I am not infertile i got pregnant my first month trying ) Any ideas why this is, my perscriber doesn't know?