Ovulating or implantation bleeding? So confused

What do either one of these look like? Period was due on the 16th according to glow and still hasn't showed typical though as I have an irregular period. Tuesday or Wednesday last week I had slight I mean just a slight pink  string thin line in my cm when i wiped and I did it twice to be sure and it showed both times but after that nothing. Can n e one tell me or show what either one of these bleedings look like?  Cause I don't know if it was ovulation or implantation?