Spotting in day AF due?

Jenna

Per my testing and predictions I had a positive ovulation test on the 23 and 24, negative on the 25. My period was due yesterday and all through the day I had a small amount or brown spotting only when I wiped. I did have one spot of dark red ish brown last night but now it has completely stopped. I took a pregnancy test yesterday and it was negative. Could this be AF starting or implantation?