Covid😩

So the past year I’ve been following all the rules, stayed away from everyone. My boyfriend was working on the garage since we just moved and had his nephew over who’s just 6 years younger then him they both shared tools so they were holding the same stuff and obviously breathing the same air. Then 3 days later his nephew wasn’t feeling well and went to get tested and today it came back positive. Now I’m freaking out. Of course when I start to lighten up this happens. I have family members that still haven’t met my daughter because of covid and now this happens. I booked a test for my boyfriend to get tested. Has anyone had covid around their babies? I’m so worried and mad at this all. I have a 3 year old and my now 6 month old that I’m so worried about.