Sick or pregnant?

Had sex on the sep 8th. I have been tired, having headaches, been really thirsty, feeling a bit queasy and most of all the smell of cooking food makes my stomach turn which was a big part of my last pregnancy. I've taken multiple tests and they've been negative. Is it too soon? My period is all over so I can't tell if I've missed it or not. Not sure if it's just a coincidence and I should trust the tests or if it's too soon.