Hey, im 16 years old.. and the upper right side of my back and right under my chest at the top where my ribs start hurts. i recently started on birth control a couple weeks ago. i dont know if this has anything to do with it. maybe it's something else, like scoliosis? .. or maybe i stretched a muscle to far? me and my boyfriend had sex lastnight, and thurs night.. could it have been from that? ahh, so many things haha. but does anyone have an idea of what it could be? let me know

thanks!