I just had one done last week. I too, found it slightly crampy and uncomfortable during the procedure, but felt fine as soon as the catheter was removed. It's pretty much speculum, catheter, balloon inflated, saline solution, and ultrasound wand inserted. They look around, and use bubbles to check out your fallopian tubes, they checked out my c/s scar, and I asked to make sure we could vbac next time... and then you're done. Take some motrin before hand, and bring a pad for saline solution. I have had super duper light spotting, but also plenty of cm, so my body's still doing its thing. We're still ttc this cycle, too. Good luck!