Missy,
When I did FET cycles naturally with drugs lol if that makes sence. I took a drug proganova that thickened my endometrium I think in turn it also produces a foli. Proganova is an estogen based tablet I think I have none laying around here so going on the name of yours it sounds similar. It use to make me feel sqirmy in the tum. Give the nurses a call just say that your DH is curious of what it is and what it does, that way they give you a "mans answer" that is easier to understand for all of us.
Good luck I hope the last one is the magical one
Bec