What does implementation bleeding look like?

Rachel
Sorry if this is TMI. AF is due 1/28 and I have been EXTREMELY tired the past week from absolutely nothing. I have been ttc b#2 for 1-2 years, after being on the Depo shot for 6-7 years ( HUGE MISTAKE-) and I had some spotting or something. I think it might be implementation bleeding, but im not sure??