Can I be pregnant on the pill?

Hi Ladies

I’ve been on the pill for the last 6 months or so? Last month my period came early about 3-4 days before I started taking the sugar pills? It was real light too. Than it stopped 3 days into taking the sugar pills. I just kept taking my packet as normal...

now I’m around the time of a period that should be coming if it wasn’t following the packet (as it came early last month) and a week a go I had tiny spotting only when wiping for a few hours. Than about 3 days later I started cramping on and off which has been happening for the last 4 days now.. this type of cramping happened with my first .. but I’m just curious as I’m on the pill ?