I wanted to share those pictures with you so you could also see the massive difference between normal and infected uteri. The surgical instruments in both pictures are the same. They are from a small spay pack. That should help give you perspective too!
A reminder of what the infected uterus looks like:
Please have your cat (or dog) spayed when your vet recommends it. Generally for cats 6 months is fine. If you adopt an older cat and she's not spayed, it's not "too late." Age is not a disease but a pyometra is and a potentially fatal one at that.