Might sound odd but I've one friend who said she had the same too.
For a few years I've had a kind of v small amount of spotting then my period would start properly in a couple of days, that's when I would say my period started (and note it on Fitbit)
Over the last 4/5 months the amount was more at the start and the gap longer between it starting properly, currently about 5 days! I don't need a pad/cup but still do, just in case, bit of a pain and I guess it's just peri as I'm 43.
Does anyone else have this and does my period start at the spotting or when it properly starts?