One important thing to note is that as of today's data, the CDC is not reporting any locally acquired cases [1] in the States (though that does not apply to US Territories). It is possible to infer, though certainly not conclusive, that the current pregnancy-related cases are either due to travel-related or sexual transmission, or possibly local if the pregnancy is in a Territory.

[1] http://www.cdc.gov/zika/geo/united-states.html

Stay safe everyone.