HELP!! Period 5 days late !!

So my period will be technically missed after tonight .. And I’m not pregnant I took a test yesterday and it was negative and I also took one today and it was negative ☹️ .... I don’t know what’s going on with my body Also had symptoms such as light cramps , back pain etc. I know stress and all that other stuff can cause late periods but I’m not stressing at all I’m good I really just like to know what’s going on? My period has also been regular .