when does AF come back after ER/IVF?

💞SuE💞 • 39/ TTC#1 4 rounds of clomid at 25mg. 1 round of ivf/fet failed dec16. 2nd round fresh failed 14feb17. fet in april17
can anyone tell me how long after egg collection did your natural period come back?
my transfer is due in 2 months and I've been told to wait til my next period but I've got no clue when that will be 
I also have borderline pcos... this is horrible, not knowing my body