Sharp pain in right lower abdomen 14 weeks postpartum

Anyone have lower right abdominal pain postpartum? I have been having a sharp pain for 2 months that radiates to my back and I have no idea what is causing it. My abdomen is tender to touch. I had my appendix, uterus and ovaries checked. All they found was a small ovarian cyst but nothing else. Two years ago I had a colonoscopy of the large colon which was clear. My doctor said maybe its just muscular from being postpartum. Just wondering if anyone else has had lower abdominal pain postpartum?