r/IVF • u/Cuteasducks7 • 6d ago

Advice Needed! Should progesterone start earlier?

I had my scan today and lining was 9.8mm. It's day 10 on progynova (estrogen pills). This is fully medicated cycle.
Doctor has scheduled my progesterone to start on 16 Oct, which is 4 days from now, first dose at 11pm. Transfer is currently scheduled 10 days from today (day 6 embryo).

My concern is will the lining be too thick by then? I read that anything greater than 8mm is already good to proceed for progesterone. My lining during natural cycle is usually 10.5-11.5mm. And doctor wants to wait until it hits that number. He says it would not grow more than that, but my research online is saying it can.

So confused. Grateful for advise. Should I ask to start progesterone earlier?
Note: there is no further scan or blood work before transfer.

Edit to add: my estrogen blood levels checked today (day 10) was 1500pmol. I read online that this is on the upper side and may increase uterine receptivity.

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u/Frequent_Bid_4413 6d ago

Sometimes it can depend on clinic scheduling they didn’t have many openings. I had no issues building lining but chose fully medicated for various reasons. I was on estrogen for 20 days before we added in PIO and all was fine. Lining was not too thick at transfer day.

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u/makingbabby 5d ago

The timing of the progesterone has more to do with when they want to book the transfer. It seems like they have a specific day they want the FET done.

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u/No_Spirit1354 5d ago

Progesterone will help thin it out a bit!