I'm doing my first FET right now, natural cycle. Went in for baseline monitoring on day 3 of my cycle--sonogram and bloodwork. Went again on day 7 for another sono and bloodwork and was told I could skip day 8. Went again this morning, day 9.
I don't know exactly what the rest of the schedule will be, but the flowchart they gave me indicates that monitoring usually occurs on days 7-11 (more or less, as needed), and at some point they'll tell me to trigger. Transfer 7 days post trigger, beta 14 days after that. I have oral estrogen to take as directed and progesterone that I'll take vaginally as directed.
Seems pretty straightforward.