Get a bfn, then bfp?

Taylor

I’m 10dpo and I’ve had a weird dull ache in my uterus (where my public bone is, but just underneath obviously) since about 5dpo. I tested yesterday at 9dpo and it was a bfn. But yesterday, I had bad cramping and back ache, could not sleep for the life of me, and had bad hot flashes. I thought AF was coming early, but today, I’ve had the worst headache and I just got extremely nauseous out of nowhere and it’s not going away. My first pregnancy my first symptom was this dull ache and sore nipples, but I don’t have that, I just have these shooting pains in my boobs. Anyone experience this? Could it be a bfp soon?