two months late on my period

Hello.

So here is my question,

I am a full two months late on my period now, normally I am only a month late at the most if I have been sick or stressed.

The past week and a half I have been eating wayyyy more than I normally do or ever have.

I took a pregnancy test about 5 days ago and it came out negative.

I don't really have any morning sickness but usually before I go to sleep I feel a little nausea.

And the past week or two I have been tired almost all the time.

What is going on?