Pulling feeling. (Put in the right thread.)

Sorry, I put this in the wrong thread, so don't spam me.

I had my daughter 6 days ago, via c-section.
Bleeding has been decent, except for that I have this insane sharp, pulling feeling if I sit up too fast, or try to use my stomach muscles, followed by bleeding more bright red and clotting.
I clotted a lot the first 2-3 days, and after that it stopped completely minus when I get the 'pulling' feeling.
It can be anywhere from the size of a quarter to almost the size of a baseball.
Is this normal?

I didn't have a c-section, so I have no idea. But the nurse told me any clots up to the size of a canetlope was fine... now I don't know about you, but if I passed something that freaking big I'd probably have a heart attack. If you're concerned, call your doc. If it's nothing, at least then you can be sure, you know?