Chances of pregnancy

I’m like not sure if this <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> app is accurate or not but I had sex on the last day of my fertile window, it said that I have 8% chance of pregnancy and that it was high. I’ve been getting some symptoms but do you guys think I could get pregnant if I did have sex and that my partner had cummed in me?