Congrats on the pregnancy. I actually don't know for sure - but you may just ask your doctor. You definitely want to be safe! I can tell you one thing though - I am not sure if you are continuing in your workout regimen as you were pre-pregnancy for the most part, but any excess protein that they body takes in that is not used (mainly by the muscles in lifting weights, etc) is turned into FAT. Just want to make sure for your sake. You could always get the protein you need from food sources, maybe, for now. Let me know what your doctor says, I would love to know personally in case I take on any pregnant clients in the future.
Clarissa