First Thing For Everything

okay so......I'm 17 and my mom just found out that I'm sexually active with my current boyfriend...(worst moment everrrr). She set me up for my first appointment e the gyno and already bought me birth control pills but the thing is I don't know if I want to take the pills or try something else.. I'm actually kinda nervous and I don't know what I should do for tomorrow's first visit? what should I ask? what should I tell ?