Is it normal for your cycle to vary?

Megan 🇦🇺 👨‍👩‍👧

I used to be bang on 27 days every cycle, is it normal to now be anywhere from 28-32? Does it change the older you get?

Or the more overweight you get?

I’m cycle day 16 still haven’t gotten a positive LH but it’s getting closer. I used to always O CD15 now it’s gonna be about CD18? Should I worry?