Late period

My period is normally very regular and I never have a cycle longer than 40 days. I am now 5 days late and on day 40 of my cycle. How long do you wait to take a pregnancy test or start to be concerned what cause the lateness? I feel dumb asking but this has never been a problem for me. I have been very emotional and breaking out like crazy and I feel like I’m getting extremely tired doing small task. So I would assume it’s coming any day now but just unsure of what to do