First of all , sorry for your troubles . I can understand because I have been TTC for 7 years now without success. Now when you say you have been taking oral estrogen , was it doctor prescribed? IF so then did you monitor the endo thickness every month to ensure it is working ? Because if one medication didn't work then the doctor should makje changes in his protocol. I used to take something Progynova to increase my endo thickness for when I was going through my IVF cycle. It may be available by a different name where you live. I live in India.
I know this isnt much of information but just wanted to tell you what I knew and also just to let you know that you are not alone in this journey:) Good luck:)
I heard DHEA daily for 2-3 months prior to getting pregnant. just a thought ask your Dr about it.