I has sex a day before my ovulation date do i have any chances of being pregnant?

Yes: For sure - you can either wait for your period (see if it starts) or do a home test 1-2 days before you expect the period - good luck!

About 20%: In general the chance of getting pregnant in someone young without fertility is about 20-25%. So if you had sex around the time of ovulation with noting for contraception, that should be your chance of becoming pregnant.