I was also put back on the pill for a month when we first started fertility treatments and after having an ectopic to help "reset" and "regulate" my body. Birth controls will also shrink down any cycsts and "old" egg follicles on your ovaries. I was confused too by being put back on the pill, but after reading other posts, it seems pretty common.
Thank you! That really helps me understand that part. I got frustrated that I was put back on it.
I just went through IVF, they put you on the pill to regulate you so you are on a cycle they can control...at least that is what I gathered from it - I was on it for five weeks (with no period between doses) - they want all your eggs compressed as much as possible.