Consider how long you'll be on the plane for too, and how mobile you'll realistically be when you're there. I would love to visit south east Asia again but I wouldn't be going pregnant as I know I wouldn't be able to explore in the way I want, and I remember being anxious enough about dengue, etc, without being pregnant!! Same consideration last time when I was looking at New York, but realistically I wouldn't have been able to do much walking. We're sticking closer to home and going to Italy for a much more mellow experience.
I’ve been to Mauritius whilst around 20 weeks pregnant a few years ago. It was fine. I also don’t think there’s Zika etc in Mauritius. Definitely go if you have the opportunity
If this is your first I would do the trip you both have always wanted to do that would be difficult or very different to do with kids with you. Will be a while before get chance to do again!