Unprotected Sex

I had sex March 26, and we used the pull out method. Today is April 13 and this app is saying my period is late by one day. For the past 2 months I’ve gotten my period on the 16th. Is <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>’s estimation on my next period accurate? He successfully pulled out but there’s still precum. We also had sex while I was ovulating which means the chances of me getting pregnant were higher. I’m just nervous, anybody feel free to say anything !