Cramps

First month being back on BC after 2 months of not being on it, and im in my last week of active pills, and the last week and a half i have been experiencing some bad cramps. I get cramps, but never this bad. Should i be worried? I know i was supposed to ovulate around last week, but didnt know if i would since i started taking bc again and it takes awhile for it to be in your system