I'm going crazy!

I'm 19dpo and according to glow my period is 5 days late. I'm going crazy! I keep testing and I keep getting negatives. I don't know how I could be so late. I normally am never late. My last af ended on Nov 3rd. Now I'm guessing I probably have some medical conditions I don't know about. Should I go get checked out by an obgyn or go wait and see if af comes? Could I be pregnant? All I have are sore boobs and mild cramping every now and then.