I finished taking my progesterone. My period showed up 3 days later. I KNOW they told me that I needed to schedule my sonohysterogram either 10 days after CD1 or 10 days after I finished my period. I distinctly remember 10 days. Turns out, the procedure needs to be done on CD3. So I have to wait for another cycle.
Oh well, I really really didn't want to TTC this month anyway. There are 6 birthdays in my immediate family between Thanksgiving and mid-Jan. I'm ok with being out at least one more cycle.