Late/missed period

I had sex June 23rd. He finished outside, but penetrated me right after. I took the Plan B the morning after. A few days after, I got my June period. Now the month of July I didn’t get a period. My period is 13 days late according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a>’s tracking. I’m freaking out. I don’t know what to do.

Ladies.... Any advice? Recommendations? 😩🥺