ok, well maybe the estrogen can help bring AF on as well... not 100% sure. My regime involves estrogen at 30mcg for a week, then up to 50mcg, for another week, then also starting progesteron pessaries twice a day, then estrogen drops to 20mcg before transfer.

You're right though - the gonal and puregon (same thing) stimulate ovaries. The estrogen part of HRT allows the ovaries to become dormant, the progesterone builds up the lining in preparation and then they slowly take you off the estrogen in the same way your body does in a 'perfect' cycle.

:-k hhmmm.... I would say yours would be similar then - but perhaps with something else that brings AF on for you.