I had a small piece of cartilage in discharge with nasal rinse 4 weeks after Septoplasty, is this normal? (Photos)

I underwent inferior turbinates reduction + septoplasty just over 4 weeks ago. I've been rinsing 3 times a day using NeilMed. For my midday rinse today towards the end of the second bottle, a large(ish) lump of discharge came out that's roughly the size of a thumb nail. I picked it up and could feel there was a boney piece(s) in the discharge and after holding it under running water I could see a piece of cartilage(?) Is this normal and should I be concerned? Thank you!