Discharge after period

Finished period on Friday 5 days ago, the app says i started my fertile window yesterday , i had unprotected sex twice with my boyfriend 2 days ago but he never finished in me, i went to a theme park yesterday and this was on my pants.

This morning i woke up with slight stomach pains 💀

Could there be a chance that there’s still plan b in my system i took one in june and one in may.