Blood tests

Anyone have a negative blood test they said mine was 6 so it was negative but my pg tests are getting darker and I've been pregnant 5 times and had 2 chemicals I've never ever had a test come up positive when I wasnt pregnant.....anyone get a negative blood and go on to have a normal pregnancy? Also I've had 2 bloods done each took an hour to an hour and a half they came in and told me 15 minutes after labs left so I'm thinking they used my urine wich I told them would be negative because I just peed smh any luck at all after a neg blood test cuz my pg test today is darker than yesterdays