Help.

So I have a very strange question. This morning I was laying in my bed. And I got this pain in my butt. And it was there for awhile. I tried moving around but it seemed to only make the pain worse. Then a little after that I was having really sharp lower abdominal pains. They hurt so bad k was crying. Both these pains went on for what seemed like 45 mins. Now, my abdominal pain has stopped but I still feel that pain in my butt.

So my question is, has anyone had this happen to them before? I'm supposed to get my period tomorrow (its a little late) but I'm honestly embarrassed but very worried. Any input would be good. Thank you ~