What does spotting look like in early pregnancy?

I've been spotting for two days, just when I wipe. I'm on CD 31 of an usual 28 day cycle. The blood spotting has been bright red in colour. I have no real pregnancy symptoms though....no sore breasts, not tired, no nausea...so I think AF is coming but who knows. I got a bfn this morning I'll take another test tomorrow morning