i had a BT at 16 days after conception (assisted conception so we knew dates) and my beta level was only 27. i had weekly tests for a couple of weeks to make sure all was going well, and then a viability scan (some call this a dating scan - guess it depends on who refers you!!)

i now have a 13 day old bubba from that cycle - so hun, your numbers definitely aren't too low - they're just being cautious and will monitor the way they climb. it's not the beginning number that matters, it's the way it climbs...

good luck