Hi, I have been researching this of course and would only take advice from a professional, but I wanted to get more possible things it could be from people who may have personal experience.
My period has come 2 weeks after my normal period. I've been regular my entire life except after pregnancy. My child is 6 so periods have been normal for a couple of years on a 28 day cycle like clockwork each month.
I'm 40 years of age. Ovulation sticks say I am ovulating over the past week. (cheap ones from Amazon) the period seems to be ending on day 4. It seems a completely normal period with same colour blood, bright red colour.
I did rapidly gain 2 stone, over three weeks (on purpose back up to 10 stone from 8 which I felt was too thin at 5 foot 9)
Ideally I would like another baby and thinking this is most likely to be perimenopause.