Need advice!

So I could really use some advice.

I have a 1 week old and today I realized Im starting to get sick..

My roommate had said the previous day that he thinks he has the flu. So he's worn a mask whenever he left his bedroom. (Which wasn't very often.)

I was holding my baby when I noticed my body was really warm but I was having chills and I had a headache coming on.

I started to get nervous so I took my temp and it was 101.4 ): (I took some ibuprofen and the temp went down to 99 and I feel fine.)

Now I've been around/holding my baby all day and I'm really worried about him getting sick..

I've been wearing a mask and washing my hands and using hand sanitizer frequently, especially before picking him up. I make sure I don't breathe in his direction even with the mask on.

He seems to not be sick at the moment. I've been keeping an eye on his temp (but I've been doing it under the armpit) and it hasn't went past 98.5

He's eating and pooping/peeing as he normally does.

I just need advice on what to do to keep my baby from getting sick.

I'm new at parenting and I'm still learning..