I had sex five days before ovulating could i have gotten pregnant?

Yes, but: If you are certain that you know when you ovulated then the chance of pregnancy from sex 5d earlier is low but not 0%. The day of ovulation is difficult to know for sure even with opk. Further, sperm can live in the female tubes for many days though usually 2-3 days. You need contraception unless becoming pg is not a major issue. Best wishes.