I have a 25 day cycle. i am on day 16 and experiencing light pink spotting. never experienced bleeding during ovulation. could this be implantation?

Ovulation bleeding: Due to the hormonal changes that occur around the time of ovulation, some women have some light bleeding during that time. Ovulation can also cause cramping for a couple of days. It could also be "implantation bleeding", but it's too soon to know. If you don't end up being pregnant, and if it happens with subsequent cycles, i would see your doctor.