12 dpo

So I'm 12 dpo and AF is 2 days late. I tested on day one of late and got a BFN. I've had extremely sore nipples, lower back pain and cramps. I keep thinking AF is going to show her ugly mug. Even feels like she has at times, I run to the bathroom to check but nothing. Cm has a slight tint of yellow which is different then last week which was thick and white like lotion. Should I count myself out for this month with that bfn or keep waiting on AF? Maybe test again?