A few thoughts, although when I got pregnant I pretty much stopped posting and it is only recently when my 2nd child was 1.5years that I started getting back into it so I may not be the most useful person to advise you. However, my visitors increased when I reduced my posting frequency!
Can you reduce your posts by half? so if you are currently 2 a week you go to 1 a week, then you have something new going on your site regularly, but your work is reduced.
Preparing posts now and scheduling
Ask people to write some guest posts for you
Identifying some post types that are quicker to put together, maybe a link to a video of a wedding, or promoting a provider of wedding services (maybe you could send out a questionnaire to people and publish the responses as an interview).
Do you know if most of your readers visit the site direct or from a reader? If it a reader reducing your posts is probably less important because you'll reappear when you start posting again.
You prepare a birth announcement post now and fill in the details when baby arrives. This will provide a post for you, but will also warn your readers that things may change.