i see. specific pills don’t need to be taken on specific days, there’s no such thing as a “wednesday pill” or anything like that. that’s why birth control packs have different days of the week labels. your old schedule doesn’t matter at all since you have to start over now. if you want to use the same sunday start you had before, just wait to start on the sunday after you get your pills.
the only time you should ever take two pills at once is if you miss one day and take both the next day. that doesn’t apply when you’ve missed more than one day. if you miss more than one day, you start over protection-wise.
just take one pill per day, you don’t “get back on schedule,” you have a new schedule and are unprotected for a week no matter what.