What do systematic reviews say?

GnRH agonists vs HCG

GnRH agonist probably leads to higher miscarriage compared with HCG (moderate certainty).

• Gonadotropin‐releasing hormone agonist versus HCG for oocyte triggering in antagonist‐assisted reproductive technology 2014 · Cochrane Headline outcomes only
  OR 1.74 [1.1, 2.75]
  11 studies · 1198 participants
  Moderate