Pregnant on birth control?

I had my daughter over 3 months ago. I’ve been on the pill since she was about 2 months old. I’m almost through my first pack.

I had spotting the whole time I was taking the pack, and now that I’ve reached the last line of pills (I call it my period line) I’m not really having a period. I’m having super light spotting and a little bit of cramping but that’s it.

Could I possibly be pregnant while on the pill, and that’s why I’m not really having a period? Or is this normal?