Paranoid!! Please help!

I have been using the birth control patch (Xulane/Ortho Evra) for almost 2 years now. Recently, my boyfriend and I started having unprotected sex. He does not finish inside me and he also wipes away his precum. However, sometimes we have sex multiple times in one day without him washing after the previous session. I am so paranoid I’m pregnant because my period is late this week (it’s my patch free week, removed on Monday and now on Thursday no bleeding). I’m having some symptoms of my period but it hasn’t come all the way yet. I have never skipped a patch or put it in the same spot twice. I followed all instructions to the very DOT on how to use my birth control!!!!

About 3 weeks ago, I left college for winter break. I am thinking the stress is the reason I am experiencing a slight change but, again, I’m so paranoid!! I’d appreciate some peace of mind.