Am i pregnant? i had sex 9/2 condom slipped&took an eoc that day.. was on antibiotics&loestrin24, "ovulating" now 9/10. what are the chances of preg?

Check a test: Emergency contraception is used to reduce the risk of an unplanned pregnancy but it certainly does not guarantee. That being said you were also taking regular birth control of the time. That makes pregnancy unlikely but possible. Check a test to find out. Of note you should not be ovulating if you are taking birth control pills. They work by preventing ovulation.

Low: Emergency Oral Contraceptives are up to 89 % effective when taken within 72 hours (3 days) after unprotected sex. It can reduce chance of pregnancy by up to 95% if used within 24 hours. I would take a home pregnancy test if your period is 7 or more days late.