I never cycled over Thanksgiving, but I did always worry about having enough meds over weekends, etc - and I was self-pay. Depending on when you start stims, you should have a general idea of what you will need in time to get some extra by Wed, so that you are covered on Thu. I never had meds upped by more than 75ius on any given day, so any jump should be in a small increment - if at all.
I always had a spare Gonal-f at 450ius for emergency use, so that I didn't have to open a larger vial towards the end of my cycle. And, some local pharmacies will give you a refund for unused, unopened IVF meds purchased at their pharmacy, so you could get a stash to cover you and return them if you don't use them. Check with the pharmacy first, however, to make sure yours will take a refund.