Fifths disease

So this weekend I was around my nephews who are two and their mom just found out they have fifths disease (she clearly didn’t know at the time or I know she wouldn’t of come over!) I did not hug all over them or kiss on their face and I know they never coughed or sneezed on me. We were outside watching them play for the majority of the time. I have contacted my dr about it and they are going to draw blood to check. Can someone ease my mind with this? How likely is it that I have this now and how it will affect my baby?? Trying not to worry. Also, I’m 21 weeks pregnant