they didn't start your estrace with a thin lining, why you stopped birth control pills but started estrace without period coming? Is this the clinics normal protocol? What are the clinics success rates using this protocol?
Just because I have never heard of it doesn't mean that it is wrong. Maybe your clinic has had great success with this protocol and we all tend to stick to the protocol which has given us the best success. I know the protocol the doctors I work with are very different from each others.
I wish you a very successful cycle and would love to hear what your doctor says.