Alright I'm really confused, I'm 16 days (2 weeks) late for af and I've been having some pregnancy…

Alright I'm really confused, I'm 16 days (2 weeks) late for af and I've been having some pregnancy symptoms. I have really bad gas, acid reflux, my nipples are sore but aren't darkening and my breast's aren't tender, I'm really moody, increased appetite, really sleepy. And I took a pregnanacy test this morning and it's negative. I'm just really confused, could I still possibly be pregnant?