sad for yellow :(

as for my cat yellow going to give birth soon , my parents decieded to abortion. so we bring yellow to the vet at sunshine and do the abortion. i waited outside for lyke 4 hrs. we make yellow (mandol) since we are there so we waited for another 3 hrs. we reached home about 7pm? the point we did this is , if we let yellow give birth it will be hard for us and we might get complains by residents when yellow and the kittens throw their waste around and we did the abortion is also because when ninght come i will let yellow sleep outside my house and theres this black cat always mating with her so thats why we did the abortion.but the bad news is,after we did the abortion yellow seems to look unhapppy with the black cat. am i doing the right thing??? :(:(:(:(:(