Strep throat with a newborn

Christina • 🇫🇷❤️👧🏻🤰🏻 Ma vie est magnifique.

My boyfriends daughter has strep throat and she was around my 5 day old son yesterday. I am freaking out right now I want to cry I don’t know what to do. His pediatrician said to just monitor him. Advice please? I feel like it’s the end of the world.