missed pills

For the last month and a half ive been forgetting to take my bc. In total I think I've missed about a weeks worth of pills. I had sex last week Saturday and I let the guy finish in me completely forgetting I hadn't been taking my pill regularly. I was supposed to get my period Valentine's Day, and I know I'm only two days late (my periods are irregular) but because I missed so many pills could I still get pregnant? And what are my chances of getting pregnant?