Opinions please?? No rudeness

Hey mummies, my daughter has a paediatrician appointment tomorrow but my husband and I are sick I'm thinking about cancelling because I don't want to pass it onto any other children but I'm torn because it was hard getting an appointment and we'd probably have to wait a few more weeks to get in...

Our daughter has had her urine, fecal matter and blood tested because she isn't gaining the weight they want her to but our doctor seems to think it's genetics due to my husband and I being petite but just wants a paediatrician to check her out.

What should I do?