Just stopped BC (the pill) and having major symptoms

Stacy
Long story short, I was taking the pill for BC for the past 15 years.  My husband and I have been talking about TTC within the next few months so to prepare I stopped my BC after my normal AF.  This past month days 12-18 post AF I have been having major cramps, like doubled over in the fetal position cramps.  For 3 days it was on the left side and the other on the right (which was worse than the left side) I've also been nauseous and had sore breasts.  Any ideas as to what's going on?!? Should I be worried?!? My next AF doesn't arrive till June 8th.