Periods on the pill? Pregnant?

So I’ve always had really heavy periods which is one of the reasons I went on the pill. My periods would last about 9 days, when I started I had a 21 day period but now it’s usually 4 days.

My period this month was later than usual and extremely light, almost non-existent. There wasn’t much and all signs of a period were gone within 2 days. I know this could be because of the pill but I’ve been on it a while now and usually there is more than that which has led me to wonder if I’m pregnant.

Could I be? Has anyone had a similar experience on the pill? Could it just be spotting?

I’ve also been experiencing other symptoms of pregnancy too such as frequent urination, my breasts are more painful than usual etc....