I feel the pressure!!

Okay so just a little background information:

I have 2 kids that were born via c-section. My oldest is 4 and my youngest is 1.

Today, I had pressure in my bottom and above my incision. It was so painful that I had to crouch over a few times in order to relieve some of the pain. I went #2 constantly today as well. Last week, I felt very nauseated every night or right after I ate (not sure if it's related). My period is 12 days away.. yesterday was my ovulation day.

Has anyone else experienced this?