First time on birth control pills: heavy bleeding and cramps, could I be pregnant?

First time ever on birth control pills (to help my horrible painful periods) and my last full period was Jan.22nd, started spotting Feb.21st so I assumed it was my little “fake period” but now it’s getting heavier and im scared bc I could be about 2 weeks preggo. Because we trusted the pill before the dr told us to... anyone ever go through this? Were you preggo? The bleeding and painful cramps are freaking me out.