Could I be pregnant?

So I stopped taking my birth control and then had what I thought was a period. It was about 4 days of light bleeding, two of which it was just brown stuff here and there and the last two days it was red. Now, 4 days after I stopped bleeding, I'm having weird pains in my uterus. Almost like cramps but duller and not nearly as bad. I've had like all the pregnancy symptoms like sore boobs, tiredness, nausea, even threw up one morning. Is this just effects of my birth control still in my system or could I be pregnant?