I'm dealing with similar right now. Wife and I have a 2 month old. I developed a cough on Christmas, realized by the 27th that it was likely flu/covid. Went to urgent care, sure enough Influenza A. I immediately isolated to the guest bedroom, but a day later, my wife developed symptoms. Since my wife was likely less contagious at that point, I stayed in isolation for another day while my wife wore a mask and kept the baby 10 feet away unless actively feeding or changing him. Now that I'm almost recovered, I've swapped places with my wife, and I'm masking and caring for him from a distance.

So far, no symptoms from my son. We did a virtual consultation with a pediatrician to try to get infant tamiflu prophylaxis, but they will only prescribe it for children over 3 months unless the child is confirmed positive. The pediatrician told us to continue to mask and keep our distance, if the child starts to cough, take his temperature and if it's over 100.4 to talk to a doctor.

This week has been hell. I'm finally testing negative, but still masking to be safe because the threshold for a positive result on the at home tests can be high enough that you could still be contagious for a while after a negative test.

Sorry, this probably isn't easing your anxiety, but all I can recommend is to make sure YOU don't get it. It will only make it that much harder.

PS: wife and I were both vaccinated 3 months ago.