Probabilities of conception , we had sex for 5 days straight unprotected and with ovulation 1 day prior , what are the chances of pregnancy ?

With the information provided, if your partner's sperm count is normal, and there is no obstruction in the Fallopian tubes, the chances are good. If your period is delayed, obtain a serum HCG level to be certain about pregnancy, and if negative, consult your GYN physician about the need for an HSG (hystero-salpingogram) for tubal patency.

Your timing is good and statistically you have about a 50% chance of conceiving. If you have no success after 6 months then further evaluation would be indicated. If there is any reason to suspect problems with either you or your partner then starting a workup earlier would be sensible. Preconception counseling is generally available at any point.