False negative or miscarriage orrr?

Anyone ever get a false negative blood test from the Dr? Or did it turn out to be a miscarriage in the end? Or did you end up actually being pregnant?

I have tested at least twice sometimes more with 4 brands.. All came back very positive... I go and had blood work done today and they say its negative... could the blood test be wrong by chance? I'm going back to take more tests next week