Yes, crawfish is a low-mercury seafood that can be safely consumed during pregnancy—up to a few times a week, in fact. Just remember the golden rule: it needs to be fully cooked. As long as you can make sure it's prepared properly, crawfish can continue to be enjoyed at seafood boils or however else you like to eat them.
Seafood overall is a great source of lean protein, meaning that it can continue to be enjoyed while also offering benefits for your prenatal health.