Pregnancy is highly unlikely. As long as you had any bleeding, that's usually good evidence that you're not pregnant.
As long as you don't miss more than one pill, pregnancy is very unlikely.
Implantation bleeding doesn't occur around period time.
I wouldn't worry. I would continue your pills as usual. Best regards.
I don't think that the ultra light means anything.
Implantation bleeding occurs around the time of implantation, which is about 1 week after ovulation and 1 week before an expected period.