12 dpo still bfn :(

I'm on cd 27 and I'm 12 dpo still negative tests (they are cheapie from amazon don't want to waste the money till I'm actually late) I have had sore boobs and nipples since 3 dpo and it hasn't gotten any better. Extreme fatigue, I had slight cramping in the evening hours between 6-8 dpo. I don't feel like af is coming. Is anyone else in the same position as me, or have expierenced something similar and gotten their bfp! Help please