Hello girls. I have had a sore throat and runny nose for two days now.…

Hello girls. I have had a sore throat and runny nose for two days now. Today I see my son with a stream of snot and he's constantly coughing. There is no stuffiness, his nose breathes, there is also no temperature. Did I infect him? We will only go to the doctor on Monday. What can I start doing so that it doesn't worsen until Monday?