Ovulation ?

Hi ladies so this past period was really weird because it was only 3 days and wasn't as heavy as I normally am. I had some spotting the 2nd & 3rd but it when I wiped. I'm trying to figure out if the ovulation prediction is correct or if maybe I am ovulating. So on the 10th, 11th & 12th I had some spotting off & on through out day on the 10th & 11th & on the 12th it was more of a tinge of pink with discharge when I wiped but not every time . So I'm wondering if that is ovulation bleeding or implementation bleeding. I had a lil bit or cramping & back ache but I also work at a desk so that can contribute to the back ache.