I have been on ortho tri cyclen lo for 2 years now. I missed the first pill on a new pack. At the end of that pack, I was suppose to take the last green pill. I might have accidently taken the first pill (the one that i missed at the start of the pack) instead. Then I carried on and took the pills in the next pack normally. I had unprotected sex on the 7th day of the next pack, so, 7 days later. Could this really affect anything?could I be pregnant? Im really scared, I am only 17. Thanks for your help.