Unprotected intercourse a week after my period, I took the plan b, a week later I was bleeding

I'm 16. I'm sorry if this it too much info, but I really need answers. I had unprotected sex with someone a week after my period and according to an ovulation calendar it was on one of my most fertile days.i took plan b the morning after, within 24 hours. A week later I was bleeding but it was a dark reddish brown color and I thought it was spotting but it lasted about a week. My period are usually 3-5 days. I had protected sex the day after it ended. Then protected sex a last week but he took the condom off for the last few minutes. But did not ejaculate inside. And now it's a week and one day after the last time we had sex and I just had unprotected sex but he didn't ejaculate at all. So what are the chances of me getting pregnant from unprotected sex for only 5 minutes and from Pre cum? I would like to know ASAP. Thanks !