Implantation bleeding

Jennifer • I have been married since April 2014. I love being married. I work at a preschool with 6 to 12 month olds.
I don't understand my chart. I spotted on day 8-10, which I never do. I still haven't peaked on my opk's. I use clearblue advanced digital ovulation tests. Tonight when I went to check my cm I was bleeding a little. I have never had spotting or bleeding between my cycles.