are you saying that Cooper wants you to take some estrogen in the LP prior to the target stim cycle?
I was never prescribed
any estrogen by Cooper in the prior LP for priming for the upcoming stim cycle. However, I was taking E2 support in the luteal phase immediately preceeding my first Cooper IVF. Since my Cornell IVF had been cancelled and converted to IUI, I was using Endometrin plus Climara patch and changing out the patch every other day. I put on my last patch on morning of June 20, went in for beta that same morning and my E2 was 137. After negative beta, I took off the patch. First day of full flow was June 23. June 24, CD 2, my E2 was 24 and FSH was 11.
Also, for my Cooper IVF where I got the chemical, I had been taking Estrace 4 mg in the luteal phase from 11DPO to 16DPO. AFter confirmation of chemical, I stopped luteal meds and my CD2 immediately following was when I started the Clomid 2 plus 1 protocol with Davis and that cycle my CD 2 numbers were E2 less than 20, FSH 12.8.
As you can see the luteal phase E2 support didn't have negative impact on my CD 2 following. But the true EPP of patches and ganirelix really killed me.