Ovulation or implantation bleeding

Amylee
I came off bc in January after 7 years. 
Periods were initially scatty and I spent 2 months (March - April) bleeding constantly (lightly). 
Period now falls around 8th each month. 
For the last four days I've had dark brown blood (discharge). Very light, I'm only aware from doing cm test. 
So guess I'm wondering if this is ovulation bleeding if just my body been funny. Can anybody help or have any info? 

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