This has been going around on daycare as well. It's actually been a pretty big deal nationally. All the restrictions from COVID-19 has been worse for RSV, in the sense that no natural immunities were built up in the last year, and so it's been unseasonably bad this year.
We actually thought ours had it - all the symptoms, but took her to the doctor today and the swab came up negative. The doctors prescribed some antibiotics, so hopefully she'll be on the mend now. She had a fever yesterday, but we gave her some Tylenol and it had a pretty immediate effect. No Tylenol or fever today, but she was showing signs of an ear infection, so that's why we took her in.
Hope your baby gets better!