What are the chances of getting pregnant 5 days before your period if you didnt use a condom and got some pre-ejaculation in the vagina?

If this was a normal cycle in which ovulation occurred normally, the chances should be low. However, the only way to determine fertility is to check your temperature and vaginal fluid every day so that you can pinpoint ovulation. Check out: http://www.ovusoft.com/library/primer002.asp