Unprotected sex

Cass
So I had unprotected sex last night but I looked at <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and it said %7 chance of getting pregnant. He pulled out and I know that doesn't always work. I'm freaking out!  Am I just overreacting? It's only a %7 
Please give me your opinion