Didn't have my period since 2 months! Why?

Léa

I didnt have my period since 2 months i am not pregnant ,I'm 46, it is usually regular and comes on time every 28 days can the cause be stress?? I had lot of stress in my life lately and a breakup... Like 2 years ago when i had covid vaccine it also didnt come for 2 months or 3 then it was regular again till now! Why?!