HPT don't always pick-up a pregnancy is the early stages. You have to give the hormones time to build up in your system so it is very possible to have BFP with a blood test..
They say you shouldn't even bother to test in the first two weeks as there is not enough hormones running around.
A friend of mine didn't get a BFP on a HPT until she was about week 8 and another one had to wait until week 11. Don't ask me why they kept testing until then though...curiosity or disbelief???
Anyway, good luck! Fingers crossed!
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