Dark Brown CM @ 11dpo - chance it will end up being my period vs. preggo?

I've posted other questions on here and I'm TTC (8th month) and I have brown CM when I wipe (and a bit in the liner yesterday) and I'm at 11dpo (luteal phase is 14 days). What is the chance it's AF on her way vs. preggo? I don't want to test yet b/c it's too early and I'm getting really frustrated of getting AF month after month.. I'm honestly losing hope I'll ever get pregnant :( My hubbie and I have been tested and everything is a-okay and we know when I ovulate, etc. etc. and we're doing everything right and even when I think I may get my BFP I get AF instead... any input?