Does your period get really light on the pill? Before I had my daughter, I was on the pill for 9 years and never had a period. Just shut it off completely. Then, I had her, went on the mini pill while I was nursing and still didn't have one. Went on the full blown birth control pill after I stopped nursing her and never had a period, got off the pill to try to have another baby, got my period back, decided we weren't ready to have a baby and went on the pill again and now I sporadically have a period. Sometimes I will and it'll be light, sometimes I won't at all. When I went off my pill to try to have a second baby, I didn't have a period and I thought I could be pregnant. My point is, with the pill, you just never know. I went to the doctor and had them do a urine test too, and it came back negative. I'd say give yourself a month of being off the pill to get your cycle back to normal and see what happens. If you're like me, it's just reacting to the hormones you've been feeding it. But use protection! :) Good luck!