Period 5 days late after taking plan b this cycle

Should I wait for 7 or 8 days of it being late before doing a test?

I’m pretty sure I’m not pregnant. I took plan b the next day and I had some mild bleeding during what would have been my ovulation and my cycle is pretty regular. We had the slip up like 4 days before I’m pretty sure I ovulate (not according to this app) so I know sperm can live up to 5 days but we also took plan b so I’m probably fine????