Pregnancy

Hi, i’m 17, I have a boyfriend. we started dating 2 weeks ago on the 7th. We’ve had sex like 6 times already. i’m on birth control. But sometimes birth control and pulling out doesn’t always work. We didn’t use condoms or anything. Not even a month later. Again we started dating on the 7th.. didn’t have sex until a week later. 3 times in 1 night. and then a week later 2/3 more times. And then all the sudden i start spotting. My stomach hurts and i feel a little nauseous. I’m really worried I could be pregnant. Any advice?