Cycle cancellation was decided when transvaginal ultrasound scan on cycle day (9) revealed no adequate follicular growth (<3 mature follicles),if no oocytes were retrieved on ovum pick up,or if failure of fertilization occurred. If signs of early OHSS were observed at 3rd day of ovum pickup ,cancellation of ET was done with elective embryo cryopreservation as it may end with life-threatening OHSS . ET was cancelled also if any criteria of hospital admission was found