I'm only on my second cycle of clomid, and last cycle, I had very bad cramps around CD15. I'm not sure if it was the clomid or just a slightly upset tummy. I guess if the clomid is making you ovulate, or in my case giving me a stronger ovulation, then it could cause cramping pains.
I'm going to see if I get the same pains/sensations this cycle, and if I do, I can safely assume it is the clomid.
What dosage/cycle of clomid are you on?
Good luck
xx