Late, symptoms.. Bfn!

Dominique • 22 - Married 04/05/12 - Military Wife- TTC 01/13/14 - 4 Fur Babies - Raising my 9yr old Sister <3
Can anyone offer some advice? AF was due September 4th and I've had no signs of it. My cycles are irregular but my doctor has me on progesterone. That should have started my cycle but it did not. My back is killing me, I've been having headaches, nausea, indigestion/acid reflux feelings ( burning sensations from my stomach in to my throat), I'm sooooooo exhausted all the time I'm literally fighting to stay awake right now, dizziness. I took a first response on the 7th and then 13th BFN. I'm not sure how long I should wait for AF before making a doctors appointmet. I don't want to go too soon or anything. But it's driving me crazy lol! Advice????