Aunt flo was like jk

So I started spotting 2 days ago and I thought it was my period but it only lasted an hour or so but it has done this the past 3 mornings it's super light and on a tampon is brown had a lil bit of red but then it just stops and I'm like Wtf??? Thoughts? I'm due for af in 2 days which puts me at 12dpo. I tested later in the day and a bfn