I Have Missed 7 Active Pills After My Period I

I have missed 7 active pills after my period I mistook them for active ones to begin my new pill pack, I had sex once during the 7 days but we used a condom. I just realized today that Ive been taking inactive pills so I took the plan B pill 3 days after we had sex. Ive been on the pill for 2 years now. Is there chance i could get pregnant, I;m very worried, please advise.