what should I do next?!?

So I have noticed that I have been feeling a bit off lately. And it's not like I'm just tired or having a bad day I mean like physically and mentally I feel completely different and just noticed that I am 2 weeks late! I took a pregnancy test a few days ago and it came up negative and my period still hasn't arrived. Now I'm 16 days late. I also went to the doctors and the urine test also came back negative. What should I do next?!?