You should get through Wednesday OK but may (or may not) be feeling something on Thursday.
I would have diagnosed a chill picked up in the damp on Wednesday if I had not had the AZ jab on Friday. It started with a thick head (think dehydrated mild hangover), progressed through a chill and then hot and sticky. Nothing too bad (no nausea) and staying in bed plus 4 g of Paracetamol have dealt with it. So I really don’t know which of them was the cause.
Given your username I can understand "The only reason I'm not having the day off". Just don't let your new employer see it.