UH confused!!!

Hey ladies, so i have sort of just finished my period, but still getting brown discharge.... 
I toke and opk test, and i saw that...
I dont become fertile for another 3-4 days yet.... But its showing a positive when i just finished my period, anyone else had this? Or is my ovulation starting early...?
I literally just toke it so it definitely is not a vap line ( sorry about the xmas tap, was the only tap i could find)