I think I'm out

I'm 12 DPO, AF is due Tuesday.. yesterday I got a BFN and I didn't test today because all I had was a digital and I don't want to waste that on a negative result.. usually two days before AF I'm spotting but so far nothing.. I've been feeling beyond exhausted this week, not very hungry (but still craving crap) and today I was feeling hot flashes which is not normal for me.. I want to say that because I got the BFN yesterday that I'm out, but I'm still holding on hope that I may get a BFP tomorrow morning.. I had a chemical the beginning of the year and so I really just want to be pregnant this time..