Okay mamas, I'm 15 weeks preg & I am a pre k school teacher. I have a set of twins in my class that…

Okay mamas, I'm 15 weeks preg & I am a pre k school teacher. I have a set of twins in my class that got diagnosed with Fifth's Disease. Went to the dc this morning with low fever, stuffy nose and a bad head ache. I don't see my OB until the end of the week but I'm scared that I have been infected and that it's going to hurt my baby. Anyone been through this or know what I should do?