11dpo w/symptoms too early to test?

I got BFN at 8&9dpo (DUH I got too excited and started testing way too early). I have 1 more test left in the pack and don't want to go buy another one so I'm trying to wait as long as I can. I'm pretty queasy off and on for 2 or 3 days, hot flashes, lower back pain, fatigue. This morning the taste and smell of my coffee was very very off to me, which I remember the same when pregnant with my son. I read somewhere that if you have symptoms you should have enough HCG to get a BFP even if it's faint. Should I wait until the day AF is supposed to arrive (15dpo) or do you think I have enough HCG in my urine to test first thing tomorrow at 11dpo? I don't want to get a false negative but obviously the wait is killing me. I'm using FRER.