brown spotting 8dpo

El
I had my implanon removed on May 25th after two years and no bleeds. I used OPKs and tracked CM and cervix position and am pretty confident that I ovulated on June 7th making me 8dpo today. Possibly 7dpo.
My husband and I DTD every other day from the 25th May until June 11th. We have been more relaxed since as we think ovulation occurred. 
I have brown spotting today. I guess it is the not knowing that is driving me crazy. Is it implantation? Is it my period coming early because of my messed up hormones from the implant? 
Any words of support, advice or personal experiences would we hugely appreciated.