One year old is showing symptoms of ear infection is it ok to hold off until Thursday for check up?

So the past 3 days he has had a runny nose, the last couple nights he’s awoke screaming and crying. Not last night though! Slept perfect! But today he has barely drank milk. He’s been crying after attempting to drink the milk. Like he seems like he has the appetite for it, then after drinking it he throws his head back and cries. We think it’s an ear infection because from time to time he rubs ear really quickly but I always figured it was his long hair going into his ear or something.

Thoughts?