I spent a lot of time reading about FETs (or what little I could find) when my first FET failed. From what I read there are 3 ways to approach it:
(1) Natural, like what you're doing pisces. It's nice because there are no extra hormones or anything but you are at the mercy of your cycle as far as timing things.
(2) Medicated with stim drugs (like letrozole, follistim, etc) - this I think can help with lining issues.
(3) Medicated with estradiol, like barbikins. This gives you the most flexibility to do the ET when most convenient, which is nice.
My protocol for my first FET was similar to barbikins. I took estradiol 2mg 4x/day and a daily aspirin. After 10 days I went in to check my lining and started the progesterone (vag tabs) the next day. Transfer was after 5 days of the progesterone (I had 2 5-day blastocysts transferred).
When my FET failed I asked what we could do to get a lil better lining (it was 7.77mm for the first one), my fs added estradiol patches every 3 days. I'm sure I'll be a crazy, hormonal mess!

I'm also going in after 12 days for the lining check but mostly because I happened to have that day off work so it was convenient. She offered to try using letrozole instead but I have such a time with the opk's that I didn't want to stress about interpreting if it was time. So let the fun begin! Next check for me on the 21st!
How are you tolerating the meds barbikins? V-day lining check will be here so soon!!
Pisces, you mentioned it will depend on your fs if you get to start an FET right away? Will your doc call you tomorrow after your results are in? I hope you don't have to wait! Emma Rose is a beautiful name for an embryo! One of our last embryos we referred to as Emma!