Almost unprotected sex

So I had my period around 2 weeks ago.. last night me and boyfriend had sex. At first we we're rubbing against each other clothes off things got heated and he slipped inside me for a few minutes he didn't cum then we put the condom on and continued. Today my <a href="https://play.google.com/store/apps/details?id=com.glow.android">glow app</a> says pregnancy risk is at 15% I recently got off the pill a few months ago and I had my first cycle last month so our only method is condoms + pulling out. I'm freaking out a little , could I be pregnant. Also we have a two year old so thinking of another pregnancy freaks me out