I'm 11 dpo, and spotting dark brown ....could I be pregnant??

Amanda

I'm 11dpo and 3days before my period is set to start. I been having lower back pain, and a weird metal taste in my mouth? Had anyone had that before. Also TMI....but my spotting is like dark brown black and in the mix some red. How soon could I test to see if I may be PG or should I wait until I just miss my period!! Gah I'm so anxious! 😩 anyone have any helpful advice!?