Implantation

Amber • My name is Amber! Happily married for 3 years to my high school sweetheart! We have just started TTC with PCOS!
Has anyone experienced cramping before implantation? Glow says that today is my fertile week, but I just went to the bathroom and wiped blood. I'm on metformin and my cycles are usually 50-60 days. Today would only be cycle day 33. I've been having mild on and off cramping for a week. Any other experiences with this??