My daughter had the same problem. In her case it turned out to be pulled muscles.
Hi and thanks for using the forum.
Well, if you have not had your period in two months, could you be pregnant? Are you sexually active? IF you are sexually active, then I recommend a pregnancy test first. If you are not sexually active or you take a pregnancy test that comes out negative, I think you should see your doctor. This pain could possibly be hormonal or it could indicate a different underlying problem that needs to be evaluated. Hope this helps and good luck.
Bridget