to Czech Rep. This will be my second attempt planned for mid August. I have been on bcp now since my last cycle and I take a lupron depot shot later this week. Then I am scheduled to stop the bcp about 10 days after the lupron depot shot and await AF. As soon as AF starts I begin estrogen tablets with the dose increasing over time. After about 12 days or so I have to have an ultrasound locally to check lining thickness and give them the information, then they will adjust the dose of estrogen if necessary (last time the dose remain unchanged). I fly out a couple of days before the scheduled transfer. This is a fresh DE cycle so everything is linked to the donors schedule and so I have to be there a day before the scheduled transfer just in case they do the retrieval earlier than planned. I start progesterone on the day of retrieval also.
I know it was confusing for me first time around so hopefully the above might give you an idea. Your protocol may be different, all the clinics have their own way of doing things, but certainly you can be sure they will be controlling your cycle with some similar drugs so that you are ready when you need to be for the transfer.