Being about 12 hours late on a pill can mess with your cycle a little bit. That could have thrown your cycle off track, so it is possible that you could still be expecting your period.
However, you can still get pregnant on the pill, whether you are late on a pill or not. The pill is not 100% effective and I have seen many stories on this website coming from women who have gotten pregnant on the pill. So yes, you could possibly be pregnant as well. If you don't end up getting your period at all, take an HPT about 14 days later, or see a doctor for a blood test. Good luck and I hope all goes well for you
**EDIT** - LearningAsIGo is correct. I forgot to add that it is unlikely, but still a possibility.