First period after IVF, before FET

I started my first period after <a href="">ivf</a>. I wasn't able to do a fresh transfer due to OHSS. I'm now on day two of period but it's super heavy!! The cramping has been horrible too. I've had to take pain meds, which I never ever do. Has anyone else had the same experience? My RE told me not to use tampons... I've gotten the "overnight" pads and I feel like I need to change them often. It's miserable. Does this sound normal? Other than the heavy bleeding and cramping, I feel great.