HELP!!!

So my stomach randomly started cramping so bad it has made me start crying. I cannot move or if I do it hurts really bad. I'm not on my period, I just got off of it Sunday. I'm not pregnant and I am on birth control but have been for half a year now. What can this possibly be? It's like a sharp pain in my lower stomach. 
-Should I see a doctor even if the pain does go away by tomorrow?