This is cd31 for me. I have been getting positive pregnancy tests since Sept 8th. I have had 2 betas done, my first was only 16 and today was 39. While it doubled the doctor seems very cautious that the levels are low and hoping just timing is off. I think I am 12-14dpo but this month i was traveling a lot and did not verify with opk. Any thoughts? Next beta is Saturday.