Re: Spotting after skipping sugar pills
Sometimes women have breakthrough bleeding or spotting when they try to skip, even if it's never happened before, just BECAUSE the pill is like that. That's only part of the reason why it sucks. Anyway, I don't think she needs to assume that her pill isn't working anymore. Rather, I think she should assume that this time, for whatever reason, her body just didn't feel like allowing her to skip.
As to how long it will last, it's anyone's best guess. There's really no way to know for sure.