So I'm stupid

Caitlin
Well ladies, I had unprotected sex with a guy who said he's infertile only one time a couple weeks ago. Thing is that was 3 days before I was to start my period and guess what never came? Yep, my period. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says there's a 8% chance I'm prego. What do y'all think? Should I start worrying?