please help😞

im 10 days late on my period but ive been getting really bad cramps for awhile now, this pain is unbearable! its a really bad pain in my stomach and vagina i keep thinking oh its because im going to start, i even thought i was going to start a couple weeks early but im still just having this really bad pain.. i have no idea what it is. i havent spotted or anything does anyone know whats wrong with me? any thoughts..