My boyfriend and I had unprotected sex on August 7/the 6th day of my cycle (last day of my period)... We're 90% sure he didn't finish inside me, but it definitely snuck up on him and I'm worried a drop or two was inside me. My period is "5 days late" according to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> app, but my cycles have ranged anywhere from 31 to 42 days in length since I started tracking in feb 2015. I'm on day 39 of my cycle and no period.... How much do I have to worry about? :(