help!

I had my period last month for he 7 weeks.
 The weekend after I finished I started to have blood spills. It was very light and lasted three days I believe. Then during the rest of the week I had brown discharge. My period I was expecting it the 7th of this month again but the tracker said the 9th.. and I'm 3 day late and I don't want to be worried... but I also want to see if it's worth getting a test or should I just wait until the end of the month. I'm usually always nasueas and I'm more hungry then usual and I've never really eaten through out the day but now I have the need to eat. And I'm constantly thirsty.. and you body gets really hot at times or gets random chills.