PinkPeony
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Yeah that is frustrating. I think the estrogen tells them what's going on behind the scenes with the follicles. For example on day 4 when I went in they saw only 3 follicles and they were teeny tiny, (less than 1.0) so they were a bit concerned but then my blood results came back later that day and my estrogen level was pretty high so they could tell I would get more than just the 3 follicles and that they were growing. Also toward the end of stimming my estrogen started to plateau - like it was only increasing by relatively small amounts so they knew that meant it's time to trigger.