8 dpo too early?

Taylor

So I'm 8 dpo currently and the past two days I've had some moderate cramping in my uterus and a little bit of back pain. I also went to the bathroom and when I wiped I had a streak of red blood. Looked like ewcm tinged red. It was only once and nothing since. I caved and tested tonight and got a bfn. Is it still to early to rule me out?