Thanks @Heyside good to know Warren's thoughts on lining. She didn't explain how it could have dropped and was really vague with responses.
I got the call the call from the nurses and I'm kicking myself I didn't ask them why it would have dropped. I got the impression she wanted me off the phone and had to push to answer my questions. It's just one of those days I guess.
Anyway the main reason they called was to say my estrogen is good so they want to change the trigger to lucrin (which is what I had in the cycle that resulted in DD). So that's positive!
The only other info is that EPU will be on Wed. I asked them if ET would be cancelled because of my lining and she seemed a bit confused by my question and said my FS seems to think it's ok. But no confirmation on EPU time or ET date/time until at least 3pm.
I'm going to assume it's ok for Monday and have requested the earliest time (10:15) so I should hopefully get to work by 12 and only miss half the day. Not telling my boss until I know how my eggs/embryos are travelling)