Covid 19

So I had a friend come over to my house. My son was abit warm and looking sick. She is My neighbor actually. After contacting Gp they asked to get him tested. It came back positive, even mine and my husband. I told my friend. She took it nicely. But myself on the other hand is feeling soooo guilty. I know it’s Covid I have no idea we’re we got it, and her being able to trace it back to me is what is disturbing me😭😭 there was no way I could know we had covid. We are all fine, just my son that had a fever for a day. Please talk to me😢😢