S.H.
Get a second opinion. Pelvic pain is not something you should ignore, and have to live with.
I had a c-section with both my births. I did not experience anything like this, or out of the ordinary.
Your Doc should at least do some tests or ultrasound or an exam.
Do please get a second opinion, I don't know that I would feel secure with a doctor who says "nothing is wrong."
take care,
~Susan