Chances of getting pregnant?

What are the chances of getting pregnant using the pull out method a day after your period? Not even 5 minutes and it was when I lost my virginity. I bled 2 weeks later for 8 days and I'm not sure if that was my period or...? Then in Feb. I had my "period" for 3 days. Any advice for this? I've been paranoid and stressing about it.