Sounds like O to me!

I'm like the PP, usually get hardcore pain the days leading up to and on O day. First time I ovulated after 15 years on the pill it was so bad I ended up in the ER.

It's like a vice on my right-hand side and usually brings a friend, lower back ache. I reckon I almost feel the egg 'pop' on O day, as I get an intense stitch and then it just goes.

It's pretty cool to feel that O is actually happening I reckon, even if it's a bit hurty.