Yes. It is safe to eat Emmental cheese when pregnant.
Cheeses which are SAFE to eat in pregnancy
Hard cheeses:
Austrian smoked, Babybel, Caerphilly, Cheddar, Cheshire, Derby, Double Gloucester, Edam, Emmental, English goat's cheddar, feta, Gouda, Gruyere, Halloumi, Havarti, Jarlsberg, Lancashire, Manchego, Orkney, paneer, Parmesan, Pecorino (hard), Provolone, Red Leicester.
Soft and processed cheeses:
Boursin, cottage cheese, cream cheese, feta, goat's cheese without a white rind, mascarpone, mozzarella, Philadelphia, processed cheese (such as cheese spread), Quark, ricotta.