I went to watch movies twice in my second trimester and felt absolutely fine. I just made sure to get up and stretch during the intervals, but do what feels comfortable for your own body.
I know how stressful it is to worry if the loud sound will affect the baby. Honestly, the amniotic fluid muffles the sound nicely, so you are safe. Validate your anxiety, but let yourself enjoy the movie!
Since I had a high-risk pregnancy with early contractions, my doctor strictly asked me to avoid crowded places and sitting in one posture for long. If you've had any complications, please consult your gynac first.
Yes, it is perfectly fine to go to the theater. Just make sure you book recliner seats so you can stretch your legs, and don't forget to take a bathroom break during the interval.
Go right now before your baby arrives and you can't even watch a 10-minute video in peace, haha! Just grab a comfy seat and enjoy the movie, it's totally safe.
Clinically there's no harm in going to the cinema, but try to avoid extremely loud action movies as the vibrations might make you uncomfortable. Also, carry your own water bottle to stay safe from infections.
I totally understand wanting to enjoy a nice date night out with your husband before the baby comes! Yes, go and have a wonderful time, just listen to your body and rest if you feel tired.