You have provided a clear description of a post-surgical infection. You are apparently assuming that your husband's immune system will keep it in check until the nurse looks at him and he can get back into the hospital tomorrow. It is a very risky assumption. What if you are wrong? With infections, time is critical. If he goes into the hospital now he can receive antibiotics immediately.
Please read this description of sepsis:
https://en.wikipedia.org/wiki/Sepsis
I hope you make the right decision.
She is unable to reply to your post just now, she is getting her husbands signature on a life insurance policy/s