Hi Bubwishes, I would say try not too worry about the progesterone and oestrogen levels, the clinic will tell you if they are worried. As far as the HCG levels, you can go and have a look at betabase there is a big range of HCG levels and it is very reasurring. After you have your scan and see a HB the most reliable insdicator a a viable pregnancy is US because HCG levels peak between 8-10 weeks. I can tell you the HCG doubling slows down and at day 38PO my doubling time took 180 hours. Try not to worry, says the biggest worrier in the world.