Struggling and confused.

So we are ttc and I am a week and a half late.. I have taken 3 tests and all have been BFN :( I have been super sensitive to smells recently, extremely nauseated and very irritable..  (I am not an emotional person and I picked a fight with my husband last night over the dumbest things!) I'm usually pretty regular with my periods and I was wondering if there is any possible way to be pregnant and yet get negative tests?