Maybe Pregnant?

So about a month ago, my boyfriend came in me. I thought nothing of it, but then I got strangely nauseous from the scent of cooking chicken and randomly on the way to school one day. I have been consistent with my birth control. the only time I wasn't was a couple of days ago and I doubled up. Now I am supposed to be on my period and I am one to two days late... I am on antidepressants as well and have been taking them every day. My boyfriend and I have not had sex since last month... should I be concerned...