Confused with App

<a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says I have an 11% chance of pregnancy my period isn't scheduled till next week. I sometimes have unprotected sex but my boyfriend is pretty positive he doesn't have semen in his "pre-cum". He always pulls out definitely and I try to make sure we use condoms. Do I have any chance of pregnancy? I've done worse before and haven't gotten pregnant. Am I okay?