Cherie, hope you get some answers from the clinic. Depending on your hormone levels in prior cycles they may put you on a stim FET or a HRT FET.
My hormones are crap so I do HRT FETs, they involve taking Progynova (O2) to build up your lining til it's ready & then Progesterone pessaries to sustain it. You never actually ovulate so there is no problem there.
Only thing is you'll need your Progynova from CD1, BTs start at about CD10.
I hope all goes well, there's nothing worse than being geared up for a cycle & then it goes bonkers on you. I'll be watching & hoping for you.