I just had protected sex

My boyfriend and I had protected sex with a condom. <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> says my fertile window will end in 3 days. It says "22% chance of pregnancy". Anyone know the REAL chance since we used a condom? I get overly worried and need some piece of mind. I know if I'm worried I shouldn't have done it but I did