That sounds like a great number to me. With my blighed ovum last summer my first draw was an 18.5 which the RE said was fine (although she REALLY prefers to see it over 20) she wasn't ready to supplement with progesterone on just that number... yes this is the same woman that now has me on progesterone and baby aspirin (since we're going through all this trouble with Clomid we'd better make sure there's not a simple reason it wouldn't stick) .... the short of that exchange is that she can be conservative.
So, anyway, 19.9 is great, especially given your history.
What do they have planned for you next?
I'm scheduled for a beta on Tuesday am on cd12... a little early I think so they can schedule the hysteroscopy asap if I'm not pg. Mike's off to Scotland tomorrow am for a week and a half so I get to face the news, good or bad, by myself this time.