Ok

I'm 14 years old and I've had unprotected sex with my best friend last month right after my period and the on the 5 through the 6 and I've been having a sick feeling in my stomach for the past week now im late by a few days on my period anyway my back hurts,I've been getting bad headaches I've been sleeping in to like till 2:00pm and I cant seem to sleep....anyway idk if I'm pregnant or not what should I do☹☹☹ PLEASE HELP ASAP!!!!