IM NERVOUS

Natalie
Hey guys! So I I have a question... I was about 4 or 5 DPO when I started spotting light brown only when I wipe. I'm concerned because it was so early so I don't know if it was implantation or not. 
I will note that out of all my periods I have had in my 20 years I have NEVER had mid cycle bleeding before. 
What do you guys think?