Not sure about the blood test but it seems way too early to be testing. Most women obvulate around 2 weeks before their period and sperm only live up to 6 days in perfect conditions so to me you would probably have obvulated around 30th jan, and you would have had tp have sex from 24th onwards. So depending when you had sex would depend on the likelyhood of you actually bejng pregnant. You may have obvulated earlier which would change those dates but thats just to give you an idea. Unless youre trying for a baby maybe use protection in future so you don't have to worry about this. Good luck. :)
There's a possibility that the brown spotting was implantation bleeding. Since it happened before your expected period. Hold of a few more days and take a pregnancy test. A doctor or an OB won't do a blood test unless your period is late.
My period is due on 2/13 and can a blood test detect early pregnancy like earlier than a pee test?
My period is due on 2/13 and can a blood test detect early pregnancy like earlier than a pee test?
When was your period due? There are tests that can detect if you are pregnant from the day of your missed period.