Feeling a little deflated

Tia • I am 30, with no kids - hopefully one day!! Been ttc for over 6 years now. I have an awesome boyfriend who has 2 kids.
12 DPO, 4 Days late, and got a BFN!. Never had sore breasts and nipples with AF ever that I can remember in my life ...I was so sure I would get the BFP. I have some strip tests coming in the mail, I will retest in a few days I guess. I need some baby dust or a miracle I have been ttc for going on 6 years now.