My period is usually 28 days on the dot. I have been having protected sex  (condoms) but no form of birth control like the pill or anything that would mess with schedules and hormones. So two periods ago my period was late. And it came on the night of the 31st day and it came on with horrible horrible crampson the first and second days. Like nothing I've ever been familiar with.  Then it continued and ended like normal and now this cycle is starting on the 34th day!! I felt cramps starting and so I took two Advil so I don't feel too bad atm. But nothing major like stress has been going on. In fact probably a little less stress because of winter break. I havnt gained or lost a lot of weight, and I'm just confused at why it's getting longer.  I keep on getting worried when I'm late that I'm pregnant even though we are really careful about that. Does anyone have any experience with this or knowledge or has his happened to anyone else? -any info would be greatly appreciated even if all you gotta say is that it's happened to you too.