I would not recommend Radiesse injections in pregnancy. There are no published studies on its safety in pregnancy. If there was ever a complication requiring reconstruction, it would difficult to justify getting the injection.
I agree with previous authors. There is very little literature at all on the safety of injectables during pregnancy. Injections with radiesse are very unlikely to harm your baby. However, if you decided to get filler and then you did have a local complication, the remedy treatments may be harmful to your baby. I always tell patients that nothing is without risk and that you should have a thoughtful discussion with your provider!