Hi WLAB, I normally have a very similar experience with prog pessaries (and crinone), they do cause me all sorts of cramping, pinching feeling. I just checked the information on my prog pessiaries and it says that a very common side effect is abdominal cramping. Though in saying that you did get quite a few eggs at EPU and would be at risk of OHSS, are you having any of the other sypmtoms related to OHSS. Please take this very seriously, if you get any worse and your cramping goes from cramps to pain make sure you ring your FS/nurse again. I hope this settles down for you and wishing you all the best for your TWW. Big hugs