Zika virus worries me a lot.

My understanding is that it is endemic to tropical Africa. Probably what that means is that many/most people there get infected with it in childhood, leading to a mild and generally not life-threatening flu-like illness.

That means that they are likely to be immune to it. So, if a pregnant woman there gets re-infected her immune system will get rid of it before it can damage her foetus.

However, it has spread to many other tropical areas where people are not immune to it.

I am male but, as Lara wrote, if I was a pregnant woman there is no way that I would visit any of the places where the virus has recently arrived.