I don't know why but I can rarely get into your blog. It is only showing me your title. I saw your post from today on my IPhone but I hate typing on that thing so i planned to send you a message but I can't get into it?!?
Regarding doing an FET (embryo transfer) with only estrace. That is the only way I have done all of my transfers. Since I have ovarian failure, I do not produce any follies (just cysts) and I need the estrace to attempt to build a lining. My Dr's do suppress me though just in case my body decides to try to ovulate. Then I take estrace (vaginally) up to 4 mg three times daily until I have a good lining, then start the progesterone 5 days prior to transfer. And whammo! Pregnant until proven otherwise! :)
I sincerely hope that your clinic is able to pull up their socks and get your transfer finished off with some great success. I hope you see this post and I hope it helps you feel more at ease. Wishing you all the very best!