M.W.
You could have an ovarian cyst. They can cause swelling which I mistaked for bloating and the pain moved. Even though the cyst was on one side I would get pain on both. Ovaries are funny that way. Are you on any birth control at all? An IUD or a pill? I have an IUD and it causes cysts often. It might just be a normal PP pain. They happen especially if you baby was bigger and your uterus was stretched super far. If you are that concerned just call your doctor and he can tell you if you should come in for a check. I had my son almost a year ago and my OB is still on speed dial because pregnant causes all sorts of crazy things and I would rather call and know its nothing then let it go and get worse!! Hope this helps!