Chances?

Well- long story short I had shower sex on my period with my boyfriend without a condom. He didn't finish, it was like maybe 4 minutes.but he does precum most of the time. So I was wondering what my chances are of getting pregnant. I mean it was like my 3rd day and I usually have my period for 5/6 days. And right after I started to bleed again. /.\ so I hope this means it's like a 5% chance.