Pulling Out

Me and my boyfriend had sex for the first time but he didnt have a condom on him so we didnt use one and im not on any sort of contraceptive but he pulled out in time. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says im due to start my period in 3 days. Is there any chance that i could be pregnant?