Late period

Hey ladies, I was suppose to have a period 8 days ago. Sometimes my period can be a little off by a day or so but never this much! I’m on birth control however I missed a few while away for Christmas with family, I stupidly left my pills at home for 3 days. My SO and I waited till we were back home and I had taken a pill before being intimate. Yet, here we are 4 weeks later and my period is 8 days late. I’ve lately been really emotional, tired, peeing a lot and having this odd pressure in my lower abdomen.

Chances of being pregnant and when should I take a test? This would be our first baby and I’d be so excited but scared at same time! I’m still in college and he just graduated last month!