It should have no impact. For pregnant women, first of all, she cannot accept things that produce strong radiation. There is a distance issue. How far away can she keep to be absolutely safe? And when watching a movie, the radiation itself is not that big, and you can't get that close, and it won't look good if you get that close.

Of course, if she watches movies for a long time, she may mean that she lacks exercise, which is not good for the development of the fetus.