GNRH1 and spontaneous abortion: On the other hand, participants undergoing a short GnRH OS protocol appeared to benefit more from VP + SCGNRH with a live birth OR 2.84 (95% CrI 1.35 to 6.26), however while the probability of miscarriage was significantly reduced, OR 0.55 (95% CrI 0.38 to 0.80), the probability of multiple pregnancy significantly increased, OR 8.34 (95% CrI 2.57 to 37.6).