Can this get me pregnant??

So I've been on birth control pills for over 2 years but recently, my boyfriend has been finishing inside me while I'm on my "period week" as I call it so I don't take my pills for a week cause that's when I get my period. However my period is short so usually there's 4 days where I just don't take any pills and my boyfriend still comes inside me. Can I get pregnant from this?