Am I pregnant? Help!

I was having sex with my boyfriend 2 days ago and we realized that the condom broke after we had finished. The condom was completely torn and I believe the top half of it could have been left inside of my vagina. He ejaculated inside of me. I immediately bought the morning after pill and took it within the hour of having sex. 
​Glow said my possibility of becoming pregnant was 3% that day, but how can I depend solely on this app? This dilemma occured a week after I stopped ovulating and a week before my next expected period.
​How long should I wait before I take a pregnancy test? Or is there a low possibility that I'm pregnant at all??