Lining compacted? Natural FET cycle

Em

Yesterday my lining was 7.5mm trilaminar. Today it was only 6.5mm. Follicle is at 20mm and everything else ready to go so my doctor is having me trigger tonight.

I can’t find anything online about the lining compacting prior to trigger and how that might impact results. I’m already transferring a day 7 embryo (5AA), so chances are only around 25% already.

Anyone have a similar situation?

My last two transfers were both 8.1mm on trigger day. One was a live birth and the other was a chemical.