I had my 1year old cat spayed after being diagnosed with pyometra 8 days ago, she was on antibiotics for a week after. She recovered nicely, active eating and drinking and being herself 2 days after. I gave her pain and fever syrup for 4 days and stopped it since she seemed fine. For 2 days now she seems a bit lethargic as if ahe has a fever, but plays if interacted with. Does her incision look healthy? Could this be the symptom of anything serious?