Spotting on the pill during period?

G

I’ve been on a low estrogen bc pill for about a year and a half. For about a year I had heavy periods but it eventually got to the point where it would bleed heavy the first day, spot the next, and end. I’m on the second day of my cycle and so far my period is only heavy, clumpy, brown spotting, no liquid red blood. Has this ever happened to anyone else? Should I be concerned?