Concerning

I'm on birth control. Just the average ortho-tricyclen. I am pretty good about taking it every day. I'm in a long distance relationship with my boyfriend. I missed a period in August, but got it in September. Then, I missed it again in October and still no period this month. Wouldn't that mean, if I were, that I would be four months pregnant? No symptoms however. Boobs are the same size as always, no nausea, nothing. Can't feel anything in there, either. Wtf.