Plan B can only be used up until 72 hours after sex. So it did nothing taking it nearly a week later. Please read the instructions before you take something. Plan B has a massive amounts of hormones that will cause an imbalance for weeks if not months. Definitely expect it to affect you in some way in the coming times.
On the combined pill you’re allowed to miss one pill and remain protected, always check your pamphlet and follow the instructions on missed pills. It is there to help you x