Anyone taking estradiol after IVF to sustain pregnancy

[misangels3]

Just wondering if it is protocol to put a person on estrogen tablets "to keep estrogen levels over 200" per my Dr. Has anyone else had to take estrogen pills along with progesterone injections once they found out they were pregnant after IVF??
I have read estrogen is a category X drug and should not be used any time in pregnancy. When I got pregnant with IVF I was on estrogen tablets but it made more sense that it was supporting the corpus luteum that might have been damaged from egg retrieval or something like that. BUT NOW My RE has me on estrogen and treating me like I conceived on IVF however I somehow conceived naturally,surprise. I don't think i should be on estrogen if conceived naturally? I have asked them twice the only answer I get it well we like to see it over 200 for ivf patients. My estrogen was 187 and progesterone 32 they said those were really good numbers for a traditionally conceived pregnancy and fall within the normal range to even better. But somehow they are still treating it like ivf?
any help please.

[misangels3]

I posted the question above but want to add, they told me too that it was to support the lining of the uterus along with PIO. But my body is making the normal amts anyway. It does seem it is a precautionary thing they are putting me on, but category X specifically states Estradiol is contraindicated during pregnancy and there is no indication for use in pregnant women. And also states category X: the risk of the use of the drug in pregnant women clearly outweighs any possible benefit. Studies in animals or humans have demonstrated fetal abnormalities/fetal risk. I called my clinic the nurses again state Dr. is on vacation, but I wanted to see what research they had to support the use of estrogen in pregnancy. She said she was not sure where it would be but when he comes back he could see what he has. Well then i have to go another week taking it without knowing. I looked all over online and on pubmed looking for scholarly articles. Found nothing to support taking estrogen while pregnant. Nurse was pretty rude and says those studies always have confounding factors and risk of birth defects is 3-5% small chance anyway. Well I know that, but I guess hmmm I have infertility which only what 10% of couples do, and I have recurrent miscarriages which is 1% chance. So if risks outweigh benefits what am i doing taking this drug. Im stuck.
Kt