going to the movies with a baby

So I'd like to go on a date with my BF tomorrow to the movies maybe, we have a 4 week old though and I don't want to leave her with anyone just yet. Do you think it would be okay to bring her to the movie theater with us? She's such a good baby, doesn't fuss or anything unless she's hungry so if I just pumped enough to bring with us I think she'd do really well! Has anyone done this? If she were to get upset for some reason I of course wouldn't interrupt everyone else and I would leave but I don't think she would..