Unusual symptoms

I'm 7 dpo. I had unprotected sex on July 31st the last day of my period and August 5 & 6. I suspect I ovulated on the 11th because I had the worse cramps ever and horrible nasuea. I've been having nasuea, sore boobs, bloating, cravings, lower back pain and fatigue since the cramps. Yesterday at 6dpo I had heartburn and even today my heartburn got worse I was ready to throw up (TMI). I don't know what's going on but I'm not due for AF until next week and these symptoms started more than two weeks ago.