Tmi: pic! Not sure if this is implantation

I thought I wanted a baby, and have been trying for a while. Today on my 9 mile run I concluded that I kind of am ok without it. It's a lot of responsibility and I just don't feel like I can handle it.  Thing is, I had this discharge today. We had sex but pulled out. My period is due 2/10, and I'm 8 dpo. I don't know if this is regular spotting or implantation :/