I've had a bit of a look around and I cant see much in the way of topics on periods arriving early from the estimated date of blood flow onset (plenty about trying to make them come early, or late ones).
For the last few months (at least) I have had shorter cycles than the fairly consistent 29 day ones. They were down to 28 days (I ovulate on day 10, and was bleeding on day 18). I had a 26 day cycle from June to July, 28 days July - Aug, Aug - Sept, and Sept - Oct. But now I am at the start of a new period, which is day 24. I realise this is all within the realm of 'normal,' but I'm wondering why they are getting shorter between periods. None of the suggested reasons (stress, hormonal imbalance, perimenopause) seem applicable, so I am happy to accept 'bodies do that.' Could tubal ligation be a contributor? I had that done on the 15th July. Essure on the right, clip on the left.
Last period was a great deal lighter than I would have expected, with no gory flooding, so I am wondering if this earlier one is making up for that.
All in all, this is a post about regular periods starting to be earlier.