Well, I think I am posting goodbye for now.
My RE thinks that my low progesterone score back in November was a spurious result, and he was not happy that the OB just took one data point (she didn't do a pooled progesterone) before prescribing the letrozole. SO, he thinks I don't need it. I'm not taking it this cycle and already my cycle seems to be better (that is, I haven't ovulated before CD10 and my CM is better).
What the RE *did* think is that my TSH (thyroid stimulating hormone) was too high for reproductive age women trying to conceive, so he's running some labwork and put me on synthroid. I'm also set up to do an HSG and an AFC ultrasound next Tuesday (provided I don't ovulate before then), and CD3 bloodwork at the beginning of next cycle.
But since we're now no longer taking the letrozole, and are focusing on testing, I think I will wave goodbye for now and wish all of you the best of luck!!! May you all have healthy strong BFPs in the near future, and may all of those who are pregnant and/or delivered already have healthy strong happy babies in your arms soon!!!