It was a natural FET for me, mel. They did blood tests (E2, P4, LH), but I never asked what they were. They never did an ultrasound either... I take it you are doing a medicated cycle? I'm afraid I don't know a great deal about them. I do know that it was necessary to ovulate - and my temperature chart shows that it occurred on the right day.

sorry I can't help much!

BW