I would say the bleeding was because you missed that one pill, and breakthrough bleeding can last a while. If you were taking it daily without fail around the same time each day before that, I wouldn't worry about pregnancy. A properly used pill is very effective.
If you're worried about missing a pill again, set a cell phone alarm to "daily" for a time you know you're generally going to be able to take it, such as around bedtime. I do this, and it has helped me stay on track. I certainly have not become pregnant and have been using this for the nearly five years I've been in my relationship. I'm on Microgestin and take it such that I only have a period every 3-4 months (depends on what I'm feeling at the end of the third month).
If it's been a week then there is no way to tell if you are pregnant or not - it's far too early. I would say if you a,ways take your pills, and even doubled up after missing 1, it would be unlikely you would get pregnant.