I've only seen them say this many days BEFORE a missed period, which is actually one day less than when you expect the next period, so they start by having women doing math while in a tensioner situation! 🥴🤣
With my son, I knew I was pregnant as soon as he was conceived, like I could tell something was different that evening. Then I still waited multiple days past a missed period before taking a test cause if I was wrong, I'd rather just start a period than get a negative answer, but that's me. It read positive so fast there was no question about it. No need to wait the 3 minutes they claimed I'd have to wait 😅