Birth Control & Negative Pregnancy Test but no period...

Kory
According to glow, I'm over 30 days late for my period. If it doesn't start today or tomorrow it'll be two calendar months since I had a period. 
I was on Xulane and then switched to Apri. 
I've taken a pregnancy test at my doctors office (urine test) and it came back negative. 
Should I be worried? Should I call my doctor or go into see him? Has this happened to anyone else?