PELVIC PAIN

Has anyone else been on the bottom or side-by-side and he is just going at it and all of a sudden there is this sharp excruciating pain right above or right in the pelvic area? This just comes out of nowhere and happens maybe once or twice a month. But it's hurts so bad I have to push him off and curl into a ball while crying and it lasts for about 30 min! Is it just my body!?