Confused !!

Ashlyn

Hey everyone, I am new to this app! I need major help!! So my last period was June 22nd. I have not caught my period since than... I’ve taken a total of 3 pregnancy test (cheap brand) the whole July and they’ve all came back negative .. but still no signs of my period just tired , and once I eat I feel nauseous practically all day almost like acid reflex all day.. what could this be ? Pregnancy ? Something else ? What’s should I do ? Please help!