8 dpo and still getting BFN.

I’ve been feeling like I’m on my period for about a week now, bad backaches and cramping snd twinges, headaches, slight bits of nausea... I’m not nearly as moody as I am right before I start bht have had times I was super sensitive...I wonder how long til I can get a BFP?? Anyone not get one at 8 dpo? I had some bad cramping yesterday mostly in upper left side of my lower back and left side of pelvis like it felt like my Fallopian tube was being stabbed 🤣🤣😂 maybe that’s a good sign