Is lobster safe to eat during pregnancy like in a bisque? Only raw seafoods or high mercury fish like tuna are a problem, right?

Lobster. Lobster, prawns, scallops, etc are safe during pregnancy. Many large ocean fish now contain unacceptable levels of mercury due to mans contamination of the sea. Fish can be a very good food during your pregnancy. One to two servings a week is recommended. The fish high in mercury are king mackerel, shark, swordfish and tilefish. Tuna is actually ok, but salmon would be a better choice.
Yes. The main concern is mercury and the larger fish which eat the smaller fish concentrate the mercury and are more risky. Fortunately, lobster doesn't eat very large fish.