Is pregnancy a possibility?

Hey everyone!
So my last period was on the 27th may 2016. 
Before I got it I was on the pill and had brown spotting, but I was only taking it every second day. I stopped it and got my period so obviously my period was trying to come through. 
My <a href="">period apps</a> are saying that I'm fertile this week, mainly yesterday and day before. 
Yesterday I had unprotected sex 3 times but 2 of the times my boyfriend came inside me. Sorry for the TMI but he was doing me from behind but like side ways. 
What are my changes of being pregnant? 
Thanks in advance! :)