Could I be pregnant?

Lina

I have irregular periods so my everything predictions are normally days off sometimes even weeks. I had unproteced sex a couple days and leading up to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> prediction of my fertile days. When should I take a pregnancy test, and do you think I'm most likely not even pregnant? I feel like it's harder to get pregnant when you have irregular periods.