I wouldn't worry too much about the numbers. the day after my missed period, my HCG was only 102. Friday it was over 500 and now i'm 17wks :)
I have had 2 early m/c's and 1 2nd trimester miscarriage at 16wks last September.
You may have ovulated later than you thought, I would just relax and wait til your next test and if it's at least doubled in 48hrs then you're fine and bean if growing right on track :)
Thank you, I have two kids already but am excited for baby no. 3. I'm just nervous I guess. Thank you again for the peace of mind!