Real sign?

GemGem • 25
I Messaged here yesterday as I am now 7-8dpo and 6 days to AF.. I have been having consistent cramping, breast pain, back pain, hungry, and nausea when travelling ( when am normally a good traveller).. now I've just experienced pink spotting. Now either I have a very short cycle and have period a week early or could this be implantation bleeding?! :o