Does this app tell you when you should take a pregnancy test?

I'm 4 days late which is not normal for me, I'm getting very worried.

TMI:

On the first day of my fertile window my fiancé and I had sex, but his parts were more on me than in me (if that makes sense) and he didn't cum until he wasn't on me anymore. So I feel like that shouldn't be able to impregnate me, but pre cum is a thing.

Thoughts?