quick question just to cover my bases.

The situation:
I missed my first active pill of a new pack of my pills Sunday night. I realized the missed pill Monday night at 11pm when I went to take my Monday pill. I took Sunday's pill at 11pm Monday night and because taking two too close together just makes me sick them up I took Monday's pill at 2am (technically Tuesday). So I took Sunday's pill at 11pm Monday and Monday's at 2am Tuesday and every pill after that at exactly 10pm each night when I would normally take them.

The question:
Do I treat this as two missed pills and use backup birth control for seven days after? Or is this just one missed pill and no need for condoms. I ask because I will more than likely be having intercourse Sunday which will be six days after this little mix up. Is a condom necessary?

Thanks for your input!