I am not concerned. I am past the age where pregnancy is a concern (and should be impossible, unless my doctor messed something up). My daughter is a college student, and she is also unconcerned as she has no intentions of becoming pregnant anytime soon.
Here's a real question though: if a women WERE pregnant, and possibly exposed, wouldn't there be prenatal testing available to let her know the possibility of having a baby with microcephaly?? I'd imagine that if the spread of Zika continues and becomes the major concern here that it currently is in Brazil, we'd do prenatal testing and prepare women to make the informed choices about all available options in case her child does have this birth defect.