I am 2 days into my period and i have a sharp pain by my belly button, whenever i move, my period hasn't had any abnormalities. what could this be?

Uncertain: If the pain become severe or it migrates toward the right lower quadrant of abdomen then would recommend urgent eval. Pain from appendicitis can sometimes begin near the naval. Or you may just be experiencing cramps.

Abdom pain: Any pain around he belly button that hurts when you move should be evaluated quickly. Appendicitis often starts this way. A good test: if you have pain when you jump up and down, get seen soon.