While I have to admit that nothing it impossible...the chances of you getting pregnant from intercourse the day before an abortion
is so astronomically slim...I have to say, no, you aren't going to get pregnant.
Please do yourself a favor and use a condom EVERY time. Condoms not only help prevent unplanned pregnancy, they help protect against sexually transmitted diseases. Your partner can have an STD and not even know it. STDs can cause long term pain, disability, infertility and even death.