I had unprotected sex the 6th and I thought I was on my period the 11th(I think). A couple days later. I started showing signs of early pregnancy(I threw up randomly one morning, I'm more tired than I usually am, and moody). Today is the 20th and I'm bleeding again. Someone please tell me what's going on. I'm 17 by the way.

You need to go see a doctor. She/he can conduct an examination and let you know what's happening. Your symptoms may not be related to an early pregnancy but to something else that your doctor could help establish.