Implantation bleeding or period?

Emily
So today I'm due for AF and this morning I had some mild cramping and then a little bleeding but it was very light and a brownish colour and also pink not a dark red colour like a normal period. It's now a about 5 hours later and I've had no more bleeding or anything, what do you think it could be? I've tested prior to today and all bfn, at the moment I'm not thinking much off it and will see what happens over the next few days as it's still early, normally when my period comes it comes in full flow so I'm a little confused!