You missed one day of your BC pill 2 weeks ago and took it the next day then had unprotected sex yesterday what are your chances of getting pregnant?

Yes you can. Birth Control is only 99.99% effective when taken every day at the same time. If you were to miss more than 3 days, you should throw out the pack of pills and use another form of birth control until your next pack begins and wait at least 2 weeks until having unprotected sex. A pregnancy test will come in handy to be sure you have not become pregnant. The earlier you know, the better.