Could I be pregnant? Insight Please!

Okay so I started my period on the 2nd of June and had sex with my boyfriend on the 5th, the condom broke and he thinks he came in me a little bit. My period ended on the 8th and my cycle is 28 days long on average. I took plan B almost exactly a month ago and I didn't take it again because I have read that's not good for me. What are chances that I am pregnant? I've heard a lot of different things and need some insight from you guys. Thankyou!