Implantation bleeding or period?

Hannah • momma of a 👼🏼💕
The day glow said AF was supposed to be here I had very very very light pink blood only when I wiped once (this was Thursday 1/14) and I put a tampon in because glow has never let me down before and I thought I just caught her early. Went to change it later that day, and there was nothing. Could it have been implantation bleeding? There's still been no more bleeding and it's now 6 days later. I'm scared to test for a BFN