What are the chances of pregnancy when we have sex with condom during my ovulation(day 13 of my cycle)?

Depends: If your partner puts on a condom at the very beginning, withdraws his penis while still erect at the end of the intercourse and the condom remains intact, there is virtually no risk of pregnancy. You can improve the protection by using a spermicidal jelly. You may also get an IUD or take oral contraceptive pills.

Condom use: Condoms are not good pregnancy control so you are at risk for pregnancy if that is your only form of birth control

10 to 25 %: Condoms have a 10 to 25 % failure rate if no other vaginal contraceptive is used as a "backup". Condoms can and do fail regularly.