Re: Fifth Disease and pregnancy Q
Most people have had it by the time they are an adult. It's not very common in adults.
But, the fact that your sister had it as an adult too, probably means that none of you had it as kids. It's odd that you didn't have it, but not unheard of.
Fifths disease is so common, and so mild in children, we often don't ever know the kids have it. Schools don't even isolate kids with fifths disease. But, when adults have it, it takes on a whole new set of symptoms. I've known a few adults with it, but very few. They had symptoms for a month or so.
It's completely fine if kids have it. It's probably better if they do, so they don't go through what you are going through.