What can cause cramping in ur pelvis when u have to bm? i feel pressure and intense pain in my lower pelvic area

Lots: You could irritable bowel syndrome if you also have an erratic bowel habit. Also could be a pelvic floor spasm or anal spasm.

Hard stool?: The colon moves things along by squeezing. If the stoolis hard or dry the colon has to squeeze pretty hard- and that can feel crampy. Make sure you are eating enough fiber, add a fiber supplement, and drink lots of water. If this doesn't resolve your symprtoms, see your doctor.