I'm going through the same thing but I was on the pill for three years and never had a period and I've been off the pill since September and my periods are just all over the place and I never know when I'm going to start. I have one in October, skipped November, had one in December and one in jan and now I'm spotting EVERY TIME me and my SO have sex. My sister is a nurse and she told me that sometimes it can take a couple of years to get your cycle back. But since it's been a year you should just make an apt with a gyn and just make sure everything is good and they might put you on the pill to regularate your period so your not having more than one a month.