Birth control question?

So I've been taking birth control pills for a month, thing is I've been missing days. Though I started taking them constantly (on where I left off in the packet) for two days already and will continue for the completion of seven days (will still continue after seven ofc) so on the eight I'll be able to have unprotected sex. Having done this would it still be effective? Does it really only take seven days to be effective?
Birth control question?
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