Period question has anyone had this?

So I'm having a weird period this month when I was 6dpo I had super light pink after I peed and wiped was hoping it was implantation well after being a couple days late I went pee in the morning nothing which I always start early in the morning never fails so I went pee again at 12 pm and then again with the light pink but just a little heavier I was like ok I'm starting I put in a tampon and it's weird cause its brown and not heave it just covers one side of tampon I have never experienced this my whole life I always start real heavy in the morning so idk I feel a little nausea today for the first time not really any period symptoms yet though so idk if it is or not took a test yesterday it was a bfn.