How soon can a blood test tell you you are pregnant?

Answer 1

== == Some early home pregnancy tests can show a positive result as early as 10 days past ovulation and can detect levels of hCG (the hormone that shows pregnancy) as low as 20 mIU. I would guess that a blood test might show as early as 8. For most women, implantation occurs between 6-10 days past ovulation, and hCG will not be in your bloodstream until after implantation has occurred. The hormone level doubles every 36 hours or so, so even if the embryo implanted at day 6, a day or two would need to pass in order for the hormone to be present.