My 2nd blood test result is 611. My doubling time is 34hours. My progesterone level is 550 or 17.5. My beta doubling time is faster than the average doubling time.
I feel very consoled and assured now.
Here is a link that helps calculate how many heartbeats has your child taken so far.
From the link, my 20 days old embryo's heart will start beating in 2 days time.