You should get another blood test done. But false positives are rare, mostly you would get false negatives. I say you are pregnant if you have a positive blood test.
i alreadyy had a positive blood test by the hospital that confirmed i was pregnant ... blood test and everything...
I would get another blood test done and if you go to the docs they should schedule you for an ultrasound if it is positive.
i would ask to redo the blood test