* TMI Warning* period discussed

Okie dokie figured I'd ask here for the wealth of knowledge and experience.

Basically the last two periods i have had, have started in the evening (used to start at night), as usual id get heavy cramps with instant heavy bleeding, however usually my period are heavy for 48 hours followed by a couple more days of light bleeding just pink light flow, followed by another day or two of brown spotting, but these last 2 cycles have been just heavy the first evening, light the next day and as of today (CD3) spotting... I'm starting to worry this could be a problem, i have PCOS but have been regular since last year august, with cycles being 29-31days long, good symptoms like sore boobs, and correct temp shifts indicating i have been ovulating, and although i haven't temped a couple month's now I've still had fertile cevical mucous and the sore boobs (oh lordy the sore boobs are horrendous) so confident I'm ovulating, so anyone else experience this kid of change to menstruation? I don't get to see my endocrinologist until june 16 so hoping to find answers here if i can