thought I was pregnant?

My boyfriend and I had recently found out we were pregnant. Had positive home tests. Multiple of them from different days all were extremely positive. We went to the doctor and were told there were apparently no signs besides the tests that I was pregnant. They did blood work and it came back negative too. Even though I had so many positive home test results. How can this be?! Now my boyfriend is accusing me of lying about being pregnant even though he saw the tests himself! Someone help! Has this happened to anyone else before?