13 and 12 dpo slight pink and brown cm?

Katherine

sorry for the pics, I know tmi, but this happened yesterday at 12 dpo and again today at 13 dpo. I am still 3 days away from period, I am always very regular. if anything I am only one day late. I also had slight cramping on my right side yesterday and this morning. I haven't tested yet. trying to wait untill Friday as I only have one test left. could this be implantation bleeding? thank you!