Pregnant??

I’m 16 and eve says my period is 4 days late. I’ve never been that late before. I’ve been on birth control for 3 months and have been having sex the past 2 months. Plus my bf and I have always used a condom with no problems. Last month my period came a few days before I started the period pills (white pills) and this month I’m 2 days into the period pills but my period still isn’t here. Which is not normal for me. I have white discharge, bloated and a little bit of lower back cramps. I’m getting worried :( thoughts?