Think I’m pregnant

I quit taking my birth control pill around 3 weeks ago in the middle of my pack. I had some withdrawal bleeding and then I had weird spotting a few days later that was pinkish. I’ve been nauseous, tired and I’ve had back pain and stomach cramps. I even almost puked when I smelt garlic bread. Idk if it’s because I quit the pill or if I’m pregnant. I haven’t tested yet but has anyone experienced this?!