Pregnant on combined pill?

I was wondering if anyone has gotten pregnant on the combined pill or any type of contraceptive pill. I’ve had one withdrawal bleed a few weeks ago but it’s not a real period per say so I’ve heard you could still be pregnant. For the past 2 days my boobs and nipples have been tender and have been too sensitive to touch and I’ve been getting cramps so I’m not sure if I could be pregnant or something else. Please help thank u! X