Can i be pregnant if he cums around my vagina and i stick the cum in with my fingers and it's my ovulation day?

Yes: This can cause pregnancy.

Possible not likely: The chance of pregnancy with intercourse on the day of ovulation is 15-20%. If your partner cums around the vagina and you put the semen in the vagina with your finger there would be a small chance of pregnancy, but less than 15%, since fewer sperm would get into the vagina. Are you trying to get pregnant? If not, you might want to use some form of birth control.