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KatO - At CCRM it's my understanding that they like to keep you on both estrogen and progesterone until 12 - 13 weeks. I've never gotten to this point so I will know more once I have my beta but I think the reasoning behind this is that the placenta isn't fully developed and functioning on it's own until late in the first trimester. Since they completely shut down our systems when we go through IVF it's hard for our bodies to do it on their own. So they wean you off slowly so that you can sustain the pregnancy until it can sustain itself. I could be totally wrong on that but that's my understanding anyway. Each clinic does it differently though and if your numbers look good (meaning your progesterone and estrogen), on their own then I think it's totally fine to be off of the meds. Hope that helped!
So maybe it's different for long protocol? I was on short protocol IVF this time and they didn't see the need for me to keep on taking progesterone (Crinone)