I had my first beta at around 4 weeks 5 days & they came back at 1000. Tested a week later & they are now 18,439. I am going back for a repeat u/s on Wednesday to check for multiples. Not sure what to think right now!
my first BETA my numbers were around 275 and then three days later they had jumped to close to 600. Not sure if mine were above or normal, but I'm 29wk4d w/ twins :)