What Causes Pain In Calves Post Fifth Disease?

I was diagnosed with Fifth disease two weeks ago. Pain in joints went away after about a week. This past week I have been experiencing extreem pain in my calves and behind my knees making it noticable hard for my to even walk. After a full week of pain and discomfort with no sign of it going away I m left wondering if this typical when durring recovery from Fifths or should I seek additional care from my Dr.?