What Causes Stomach Cramping?

I have had stomach cramps in my lower right side that is just a dull pain. I had on Tuesday night and then again this morning. It has lasted all day. On Tuesday I ate beans but Wednesday I had fish and shrimp and broccoli. I have had several bowel moments but the cramping is still there and actually goes down my leg a bit. I have been doing a boot camp so could it be I pulled something.

Thanks,
Erin Messer