Cabergoline and Coasting to Prevent OHSS

Long luteal GnRH agonist protocol: patients will receive GnRH agonist from day 21 of the previous cycle of stimulation and then on day 3 of the stimulation cycle they will start hMG injections with 225 IU/day. Folliculometry will start on day 6 stimulation by vaginal ultrasound. Estradiol levels will be measured on day 8, 10 and 12 of stimulation if appropriate. According to ultrasound and estradiol level patients will be randomized to either one of the study arms. When ready final triggering will be done by human chorionic gonadotropin (10000 IU) and oocyte collection is done at 36 hour from triggering. Embryo transfer is then done 3 days afterwards with ultrasound guidance.