Pregnancy tests

I took 3 pregnancy tests all with nothing showing up. Is this normal?

So I took 2 pregnancy tests last night and one continued to stay blank while the other had a negative and what looked to be a positive but some said it could have been the evaporation line. The 3rd one i took, again absolutely nothing. I’m 1 week and 2 days late with no symptoms of my period. I always cramp or breakout before but nothing.