Today at work, I went to the restroom during my break. I was very surprised to see that I was spotting. See, my cycles are about 54 days average, and I just had a cycle beginning of May. I wasn't expecting a cycle until end of June. I have a LOT of back pain very achy muscles, some slight abdominal cramping, and the spotting has tapered off to hardly anything. It's been very light red/pink in color. I can't tell if this is just my period starting on time for once, or implantation bleeding? Or something else entirely. Thoughts??