Shortly after ovulation you have very low chances, 48 hours after you have almost none. Having sex every other day in the days leading up to ovulation and sex on the day of would be your best bet.
Sperm can live about 5 day in fertile cervical mucus. Try to be intimate leading up to ovulation. That would increase your chance of becoming pregnant.
I think the chances are slim. The egg lives for about 12-24 hours after you ovulate.