On the chart from BabyMed I appear to be really quite close to their average (which I assume is a median) for 19 dpo, which is 303. (And thanks BabyMed.com for making it impossible to include my fancy chart.)
I go back for Beta #4 on Monday and then have an u/s (are you kidding me?) scheduled for Thursday.
But my E2 is still a bit low (no, I don't recall what it is), and this started so low that I can't get past the fear right now that this will go on for a bit and get me convinced it is going to work and then all come crashing down. Last time I felt much more confident since my 10dp5dt beta was 254 and it was above 1300 3 days later.
Only time will tell, I guess. But sweet Jesus do I hate this part.
So, in summary, today, things look good-ish*, but I am scared sh*tless that this will all end badly.