Cramping!!?? First end Clomid

Brandy
Cramping! I done my first round of Clomid this month and have been on metformin for 8 months. I am on cycle day 10 and have had really bad cramps even in my legs. Cramps are on both sides.. almost feel like I should start .. took an opk but it was neg .. anyone else on Clomid have this issue and did you O?