plan b & otc cold medicine.

So the guy that I have been seeing for the past few months, we decided the other night to have dex without a condom. Well I didn't think anything of it and decided to take plan b right after. Well before class yesterday around noon I took a Tylenol cold and flu pill. To clear out my sinuses. Does that cancel out or counterbalance the plan b? Do I need to go buy another one?