This is generally a simple answer in most situations.
Fortunately for you, this answer is short but does require some contextual qualification.
The health of your teeth and mouth is still a vital part of your overall well-being, and your well-being is paramount even more when you are pregnant and caring for a little one. So what we should do, as a public service, is address this question in various contexts.
We can say that in general, however, the answer to the question is yes, with caveats.
Scheduled Cleaning: Do I Cancel?
If you are pregnant and you have a regularly-scheduled cleaning ...