WHAT CAN I DO? HELP!

My AF is usually regular. I get my AF 7 days every month well on july 29 i had un protected sex and on july 30 i got my AF very very heavy for 2 days and on the 3rd day i was spotting by the 4th day it was gone. a couple days later i was spotting very dark brown for a couple days , then discharge. on August 13 was my Ovulation date i had sex the week before and the whole week of ovulation. Im 11 days today POD and i took a pregnacy test the day before yesterday (clearblue ) and a faint line came on, i took 2 yesterday first response and 2 BFN! AF is due on August 27 , 3 days away. but ive been having lots of symptoms naucious, pelvic pain, lower back pains , very very tired, fatigue, dizziness, emotional and well as my

boyfriend hes had the naucious and dizziness at work in the mornings for the past days. . Idk what to Think anymore because as soon as i get my hopes up i end up stredding it and my boufriends too . So what can i do? any suggesrtions?