So tiggerlinda, the uterus actually does react so soon sometimes? This is what I was wondering. It's not OHSS, as I have been feeling fine the last 3 or 4 days. I did feel a bit of a twinge with the embryo transfer this time, like the doctor sort of 'nicked' the side of the uterus or something like that. I did a session of acupuncture this afternoon which resulted in the abatement of the cramps (dull cramps) but now it's back.