so i’ve been on the pill for two years and my withdrawal bleed for a while would start wednesday but for like the past 6 months it has started on thursday or even friday. so i’ve gotten used to it starting on those days. I wake up this morning on wednesday of my sugar pill week and I’m starting to spot already and it looks like it’s the start of my bleed. is this something to be concerned about? should my period be starting on the same day every time while i’m on the pill? or is it normal for it to move around from like day 4-6 of sugar pills???