I just asked to be booked in with the nurse for a blood test to check that my hcg levels were rising because when I was pregnant with Beth and was telling the midwife how worried I'd been she said next time I get pregnant to just book in with the nurse at the doctors and have the levels checked, so that's what I did.
The receptionist said the doctor hadn't looked at the results yet because they'd only just come back, so she was reluctant to give them to me but did anyway because I asked.
The calculator I used said that after the first 4 weeks it takes longer for them to double and that it's taken 3.5 days for my levels to double, which is within the norms for 6-7 weeks, and I'm 6+3 today.
I just saw it and panicked because all I've ever read had said they should double every 48hrs.