Yellow discharge from right nostril 4-days post-rhinoplasty - is this normal? (photo)

I am a little worried as I seem to have what looks like a thin layer of pus on my right nostril. I did closed rhinoplasty and was placed on cephalexin antibiotics for 3 days, then instructed to put saline drops in my nostrils every waking hour. The left nostril seems to be clear of any pus. The discharge from my right is a yellow colour but what appears to be clear. Should I be worried

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