TChameleon wrote:

Is it possible to be 3 months pregnant and have a HPT come back as a negative?

If you test 3 months after your last encounter and it comes back negative would
that be 100% accurate?

Basically I'm asking at what point would an HPT be 100% accurate?

Never. No test is 100 percent accurate. There
are women who don't get positive HPTs and deliver babies.
It's not common, but it can happen.

Best wishes,
Ericka