birth control / cumming

Briana • Bri 💕
Okay so I've been on BC since I was 16 ,( I'm 19 now)  just October my dr refused my refil, so I was off for about a couple weeks, but then I got put back on on the 9th , I've been taking it faithfully, but my man cummed in me at least 4 times since I've been on it, how big is the chance of pregnancy?