Implantation?!

Sorry for asking another implantation questions when there are already a bunch out there! I just couldn't find an answer... so I'm due for my period in 3 days, but today I started cramping for a few hours. Nothing really painful just uncomfortable. The cramping finally went away and when I went to pee there was light pink blood mixed in with my cm. I haven't had it since so I don't know if it was implantation or just AF showing her ugly face early...also are cramps normal with implantation and more focused to one side? Thanks for any answers!