Hiya
I think, any symptoms you have that are out of the ordinary are normal for you. You're five days late, that could well be the start.
My experience was - years and years of a 29 day cycle - then it just changed.
Never 29 days ever again. 21, 37, 42, 16 - etc.
It's been about six years for me now. The first year the cycles were shorter - the last hurrah at being fertile - then the appearance of the odd looong stretch.
I am now on day 180 - 180 days without a period. That's six months. I await the flooding!!
So yes any change to the cycle I think could be it.
I started on Menopace and that made a big difference. I was getting anxiety and didn't like it, and irritability, and didn't like that - Menopace made a big difference.
I changed my eating - more fasting now - keeps the weight down. And I rest a lot.
And I had to get my head together about it. It's a funny old thing but I think I'm OK with it all now.