Period late and not sure why ?

[Peanutbutterplease]

I am 100% not pregnant.

My periods can be 28-34 day cycle I've learned to live with it but it always comes along those basis .

I'm on day 41 and no period. Now its been the festive period and very stressful and if I'm honest I am quite stressed a lot anyway . Well I'm late 30s no signs of the change or anything like that I guess my periods have got lighter but still last 7 days like always . I just want some advice really or anyone who has experienced this too .