So I got my blood test back and said it was at a 2??! But why in the heck have I tried two different types of frer and a different brand and getting positive?

It says that I took a Walmart cheapie and dollar tree cheapie and got neg. but have taken 4 frer and a family dollar brand the last four days in the morning and got positive results so went to the clinic and they gave me a urine test which came back neg. ?????? Why ?????