Pregnant with neg tests?

Has anyone ever been pregnant and never got a positive test? Urine or blood? I've been going bat shit crazy doing a bunch of research.

I feel nauseous, I smell EVERYTHING and everything makes me sick, I smoke (I know it's bad, leave out the lectures pleeease) and cigarettes taste bad now, I'm craving things I've never liked before, I feel bloated half the time, my mood is always hit or miss...but I did bleed during the time I was supposed to get my period. But it wasn't like my normal periods because it didn't clot at all? and I've taken like 6 tests at home and they're all negative as far as I can tell. And I had a blood test done 2 weeks ago and they said it was negative. Idk. I'm just really skeptical after all my research.