Am I Pregnant or is my body being weird?

I was off of my birth control for 3 months and I restarted a month ago. I started bleeding two days into the sugar pill week of the pack, but it was super light and lasted only 2 and a half days, which isn't normal, even when I was on the pill. Now I've been cramping for the last few days. I did miss my pill twice. I just want to know if I could BE pregnant or if my body is just being weird. thank you!