1 week late and a negative pregnancy test

Please help!

AF is playing hooky! She was supposed to come on December 26th. I took a test on 28th because it's not like her to be more than a day or two late, and it was negative. I've been having a few symptoms, such as constipation, hot flashes, cramping and a little nausea. I took another test today which makes it a week and it came back negative too. I keep getting my hopes up by caculating how far along I would be. It's been 5 weeks since my last since AF last visited. Idk what to do, I'm going crazy!