possibly pregnant?

Tess

I'm 22, and my period is now 16 days late. went to my ob/gyn on Thursday, urine was negative. Now I'm getting pains on the right side of my lower abdomen, where my right ovary should be. I'm very tired and moody and my nipples are sore to the touch. I have had cramps here and there like I normally do, but no period. Any ideas?