What's going on

Today I took a pregnancy test it turns out I'm not pregnant but my period is already 4 days late...

I was supposed to start my period on 11/28 and it's already the 12/02 of December

Then I also took my ovulation test and it turns out I'm not ovulating yet...

Is there something wrong with my body?

I haven't exercised or changed anything of eating or stuff I'm in a healthy shape and everything just not sure why I'm missing my period for more than the day I usually start

And yesterday I had to get off work 2 hours early before my clock out time cause I felt very nauseated and today this morning I feel nauseated and it's only 1:16 pm...

Please help me