Covid & my kiddos

I have three beautiful boys 8, 2 & 7wks. My oldest started out with a sore throat two days ago, then progressed to runny nose, congestion, cough, watery eyes and now is running warm. I’ve already called his doctor to get him in to be sure and covid tested so go in tomorrow afternoon they had nothing open for today. I’m worried about my boy, but also scared that he will give whatever he has to the littles, especially my youngest as he’s so small. I’ve been keeping my oldest up in his room and away from the others as much as possible and I’ve been spraying Lysol on the couch after he gets up. If he does how covid how can I keep the little ones safe? How can o be the best mom I can be for my oldest taking care of him but still be a good mom for the others and keeping them safe. I’m struggling and scared. I don’t know what’s real and what isn’t with covid. I don’t know who or what to believe. My anxiety is getting the best of me and I’m starting to spiral.