D.W.
I do not think you are pregnant. You can miss one and take two the next day. The cervicial lining got thicker to help protect from getting pregnant. This is what the birth control pills do so you do not get pregnant. Now,if you miss more than one pill in your pack then there is more to worry about. I think you are fine. I was on bc for may years and never had any issues if I inadvertently missed a pill.