Spotting a week early?

Lisa • 𝓛𝓲𝓼𝓪 𝓭𝓲𝓪𝓷𝓮

I'm in the TWW and I can't test till next week (AF is due next week) but im lightly spotting today and yesterday, what could it be? I never had this before and my period is never never never early.