stitches & healing

I am 16 days postpartum & I decided to take a look into my vagina to see how things are going... FYI: I had a tear during delivery & had to get stitches. I never asked what degree tear... As I looked I took a picture with the flash and noticed a lot of yellow stuff, I couldn't tell if it was discharge or if my insides were yellow. I never seen the yellow discharge on my pad either. There is a bit of a bad smell when I change my pad. Could this be an infection? Anyone else noticed the yellow stuff inside?