I Started My Pack A Day Late (last Monday). So

I started my pack a day late (last Monday). So I took Plan B on Wednesday... and I had sex on Saturday. Should I take another one today? I've been taking them every day and I had two monday... But today makes seven days. Not Saturday. I used condoms. But I wanted to know if taking Plan B today (two days later) additionally would be any more effective than the condoms and pills (though I missed the first).