Just been given my protocol for my first IVF cycle next month and surprised at how much progesterone you have to take and for how long. I asked the nurse and she said that, unlike a natural cycle, with IVF you don't ovulate and so there is no corpus luteum which is what gives off the progesterone, which makes sense. If you do get pregnant though, does your body not start making its own progesterone? Not clear why you need such massive amounts for so long. I know it must help but is it so critical? Do all clinics do this?
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