I have never had OHSS but I have read about women having cycles cancelled due to it...I guess it depends on how bad it is.

Do you have PCOS because I have that many follies when my PCOS is active (ie. not when I am doing IVF and on stims).

Normally they want the dominant follie to get to 20mm or thereabouts before you trigger. Maybe they are using the pregnyl to get a few dominant follies quickly so they can do the pickup sooner rather than later ?????

I would ring your clinic today and ask some questions.