Well I'll have to go against the grain and say it CAN be a big deal, and by that I don't mean anything regarding the pregnancy or hurting the baby. We have NO idea where I got it from when Nathan was 4, but I did get it. Then I gave it to my wasband and then he gave it to Nathan. (I mean, not on purpose but heck we all shared a household!)
It can affect women differently that men, and of course differently than children. I have a fairly high tolerance for pain (for instance, I mostly only take Motrin after my c-sections, etc) and I was miserable. Not itchy at all like others have mentioned. But it locked up my joints and I couldn't move my hands or neck for 3 days. We ended up having to get someone to come take care of me because I could feed myself or really move at all. When wasband was at work, someone had to be there to help me. I took sleeping pills so I could sleep through the pain. My neck pain was so bad they tested me for meningitis.
The doctor said it was one of the more serious cases they had seen and they did a rubella titer to make sure it was in fact, 5ths and not rubella. Sure enough, it was 5ths (the symptoms are similar).
Anyway, like magic, after 3 days I felt fine! It comes and goes just like that.
My point is, the symptoms can vary from person to person but NO, I would not worry this late in the pregnancy other than if you fall ill, and get a bad case of it, having to take care of Avery by yourself.
My wasband didn't have it too bad. He had a fever and felt lethargic for one day and then he was fine. When Nathan got it, he only laid on the couch for one morning with the rash and fever, and then he was fine.
I had lingering joint pain after it, I had what they call reactionary arthritis, which can last for 6 to 24 months after the viral illness, but I also was an aerobics instructor at the time, teaching 2-3 hours a day, so it's hard to say how much of my joint pain was from overuse.
The lingering joint pain is very common, and I've heard many women complain of it, but it's tolerable. Nothing debilitating by any means.
I seriously hope you don't have it, but not for fear of the pregnancy...for fear of surviving not feeling well while trying to take care of Avery. Is there someone that can help with him if you do come down with it? If you do get it, I'll pray that you don't have it "bad".
((hugs))