Could I be pregnant? 2 negative and 2 positive tests

Ashley
I took the first pregnancy test over a week ago and it came back negative. I took another test yesterday morning and it was positive, later I went and bought a clear blue digital test and it said positive 1-2 weeks. I thought I was pregnant so I went to the doctors and they tested my urine and it came back negative. Am I pregnant? Is it false negative? 

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