Possible covid

So I gave my best friend a ride from the airport yesterday. Me and my 2 y/o. She wore a mask. We didn’t. She did cough once during the 15 mins drive. She tested negative before but tested positive today. Anything I can take or do to lessen me and my baby’s chances of developing full blown covid symptoms. I am vaccinated. Vitamins? Got beverages? Etc please. My throat is beginning to feel very slightly scratchy. I don’t know if it’s my mind or covid 😫