Am I pregnant?

My last period started on March 8th (ended the 11th or 12th). We did the do on the 12th, but I forgot to put my birth control patch on. I figured it would be fine, and I didn't want to mess up my cycle, so I just didn't put the patch on. For that reason, my husband and I had no sex all month. But now I am 3 days late on my period... is it possible that my cycle is just messed up from me not putting on the patch? Or am I preggers?