Is There a Need for Luteal Support in Modified Natural Cycle Frozen Embryo Transfer Cycles

In one arm of the study the patients receive no luteal support as part of their modified natural cycle frozen embryo transfer.

In the 2nd arm the patient receives 2x200 mg vaginal progesterone as luteal support.

In the 3rd arm the patients receive 2x200 mg vaginal progesteroen plus 125 mcg recombinant HCG s.c. on the day of embryo transfer and 62.5 mcg recombinant HCG s.c. 4 days later.