Pregnancy

So i'm not sure if i'm overeacting or if i'm really pregnant but i need help. I'm too young to be pregnant. Me and my boyfriend had unprotected sex about 5 times within the past week and I'm not sure if i'm experiencing symptoms or if im just psyching myself out to think I am. Yesterday , i tasted a metallic taste in my mouth and i'm not sure if maybe that's because i had cut my cheek (i have braces) my stomach has been feeling odd but that may also be because i've been more aware of it lately. Last night i was spotting. My period is supposed to be coming in two days and i'm not sure what to do. I'm freaking out. Help?