Concerning my birth control

Patient: Could I be pregnant? I missed a pill an active blue pill (Tri cyclen lo 28) on Friday and had unprotected sex on Thursday however he did not finish inside. I have taken my pills regularly every day since than. Before when I was on Alesse, if I did not take my pill the exact same time every day I would get a brown discharge. I have the same thing now, could this be from the missed pill?

Symptoms: Brown discharge