Firstly, I do no think Estradiol and progesterone pills are bioidenticals. I believe you are taking pharmaceuticals. There is a huge difference. I would never just stop taking prescribed meds, especially ones you have been taking for years without discussing with my doctor.
I get my bioidenticals and HCG from the same physician. She told me the bioidenticals would not stall my HCG. She was wrong, it did. I was losing a pound to 1.5 lbs per day and then started the bioidentical estrogen. I immediately stalled and stayed stalled for 18 days. I decided to end Phase 2 and start phase 3. I was able to maintain the weight loss on phase 3 with the bioidenticals. I had to stop them when I began Round 2. I have had no problem so far. I do not take the bioidenticals when I am in Phase 2. I hope this helps. BTW--I am on the Wiley Protocol, those are bioidenticals. Good Luck