Much like one can avoid malaria by staying away from southeast Asia and/or taking appropriate medical precautions, the best way to prevent pregnant women from getting the Zika virus is to discourage them from traveling to areas where it is known to be prevalent. Additionally, once a woman has contracted the Zika virus, she should be kept away from other pregnant women until she has been safely treated.
However, there's still much that needs to be learned about Zika's effect on fetal development. Some infectious-disease experts believe that avoiding pregnancy during the coming mosquito season is the only way to prevent the birth defect microcephaly. Federal health officials recommend that pregnant women avoid areas where Zika is being actively transmitted by mosquitoes.
Pregnant women are on the front lines of the battle with the Zika virus. This ghastly virus has caused microencephaly in newborns, regardless of when the virus was contracted during gestation. There are some ways of protecting the mothers, however, which includes avoiding being outside in the afternoon, spraying or removing standing water, Utilizing sonograms to verify normal brain growth of the fetus and the biggest strategy, which is avoid traveling to Zika prone countries like Brazil, Jamaica etc.
The most important and effective safeguard for the moment, until further research has been done and we have a better understanding of the transmission vectors of the Zika virus, would be abstinence or contraception. No other protections or safeguards can be guaranteed to not leave an unfortunate legacy for the future.