Period right? A bit tmi-sorry

Alexandra
My period are always heavy, ALWAYS and last about 3-4 days.  Last month was light and glow said my period was due the 3rd. Well no show and then the next day (4th) I had light pink spotting. It was half the day and night and it didn't even fill 1/4 of the pad. I was thinking great it's my of, it will get heavier. Today is the same if not lighter. Does anybody know what this means? Am I Just being ridiculous? It's my pd  right!?