I had strep when my DD was about 22 months old. I didn't stop nursing or really do anything special, though I was more careful with hand washing because I didn't want anyone else in the house getting sick. I may also have wiped off door knobs and light switches and things--but that has nothing to do with nursing! Nobody had even a hint of illness other than me.
You were probably contagious before you had any symptoms. I wouldn't give it too much extra worry.
Catherine, tandem nursing mama to Preschooler Girl 9/08 and Toddler Boy 3/11
Breastfeeding for 4 years and counting!