Is it possible to have nausea before BFP

Hi, me and my husband have been TTC for a month, I'm due on my period on Sunday , had cramping a week ago, done a few tests through the week and all BFN. Started to feel nausious which is somthig iv never experience a leading up to my period, just wondering if this could happen before bfp and is it possible to test negative one day, then positive the next, got my fibers crossed ! Thanks !