forgotten bc

Ive been on bc for a while but stopped taking it regularly when my bf and i broke up for a couple weeks but i started again and i took a full moth last month and im on day 3 today, but i forgot to take my pill this morning and we had sex this afternoon. Right when i got home i took the pill, is there a high chance i could get pregnant. We don't use condoms and he didnt pull out fast enough so a little got inside of me...what are the odds?