Looking for advice..

I’m on cycle day 10, I have short cycles of 24/25 days, 6 day periods. Today I’ve been having some cramping and when I went to the toilet I had some pink milky discharge when I wiped.. I don’t do ovulation tests as I was getting way to obsessed so not actually sure when I ovulate! Based on Glow predictions I should ovulate cycle day 12 (Sunday). My question is could it of been implantation bleeding? We have had sex everyday day the last 4 days.. thank you! X