implantation bleeding or not? Help

Okay so I'm 11dpo but feel that I have a lot of pregnancy symptoms however I received a negative test on a cheapie this morning.. I don't want to let go of hope just yet. I've had 2 pregnancies already 1 healthy baby & 1 stillborn. I have never experienced implantation bleeding but today I whiped and it was the lightest pink ever and that was it just one whipe and it's gone. My period is not due for days. Can someone explain what implantion bleeding is like??