When Professor Ulana Khomyuk visits the hospital in Moscow to talk to the plant workers, she sees Lyudmilla in her husband's room, inside the plastic, and inmediately goes nuclear (pun intended). When the nurse comes in, Professor Ulana Khomyuk asks her something like "How can you let a pregnant woman in here?".
The thing is, Lydmilla is pregnant but it is not visually evident yet, how can Ulana know? Was there some scene where they met before that was edited out of the final cut? Did I miss something?