Spotting?????? Thoughts?

Hi guys, I have been symptom anaylising for the last 2 weeks- sore breasts, cramps, the usual. I was due for my AF to show today. I thought I got her following some bad cramps which woke me up. Flow was very light, which is unusual for me (when I get my period, I get my period) I'm going to see how things go tomorrow. Possibly do a test if AF doesn't show up properly as it could just be implantation bleeding??? What do you think?!