What to Do?

I've been on my bc pill for 2 years now & recently forgotten to take the first pill of my 4th week now I know they say the fourth week doesn't have hormones or anything because that's period week & dont need extra hormones going through our bodies lol. Which can be okay right? Now my period is for the most part regular every 4th Wednesday of the month only this time I never got my period it's been 2 weeks should I be concerned & grab a pregnancy test to be sure? I don't know what to do