Hollo, like you say, it may be your cycle kicking back in. Or could it be that you are now feeling a little bit of ovulation pain? Are the 'contraction" like pains every day? Or Once a month?

(The reason I suggest this is that I never ever got ovulation pains prior to having babies. Now that my cycle is totally back to regular I DO get very noticeable ovulation pains.......the first few months this happened I remember thinking that it felt like mini-contractions on one side!)