IUI yesterday, feel like I’m carrying around a brick in my uterus!

Catherine • TTC #1 @37 via IUI/IVF

Has anyone else had this heavy, stiff, bloated and crampy feeling after IUI? What in the world causes it, and when will it go away? I wonder if any of it has to do with progesterone kicking in. I only had one big mature follicle, but it was big.