The investigators will use Decapeptyl on day 2 of menstruation followed by antagonist protocol.~Hormonal proflie including E2, P, LH, FSH will be measured. LH surge and the rest of the hormonal profile will be compared to day after ovulation triggering.
GnRH agonist triggering is used during ART in order to reduce the risk of OHSS. Some studies described that in up to 5% of the cycles triggered with GnRH agonist, a lack of respone or suboptimal response was displayed.~The investigators aim to asses the possibility to predict the respone to ovulation triggering by the response to decapeptyl in the follicular phase of the same cycle.