I am not sure whether this will answer your question but a week before my period was due to arrive, i had what you are describing....a brownish/pinkish twinge of colour in my undies and I thought it was just my period starting early. This lasted about 2 days and I seriously thought nothing of it. I was probably about 2 days late and I tested with the clearblue digital pregnancy test and to my surprise its said Pregnant!!! So i guess it sounds like implantation bleeding to me.
I would say wait a week then test again because you are testing too early. HCG levels maybe low at the moment.
My implantation bleed was bright red blood, just like AF arriving. And there was so much of it that I had to use a tampon (not knowing that I was in fact pg at the time! LOL) I didn't have any pains or cramping with it. That was at 12DPO and I got a BFP two days later at 14DPO.
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