27 weeks pregnant and I'm so annoyed!

So we've been temporarily staying at my boyfriends moms house till our house finishes getting renovated, he has two brothers but one in particular i can't stand! Everything he does annoys me and he is so inconsiderate and weird. He always comes into the room we're staying in without knocking and opens the door loudly it especially bugs me because when he does that I'm trying to sleep. He also likes to come and just hang out in the room and blast his music the room is super small he makes these annoying weird high pitch noises constantly that drives me nuts I feel like pulling my hair out I like to be alone and i just don't get why he has to be in this room when he has the rest of the house To hang out in!!!! I need my damn privacy I've already told my bf about it and he has done nothing. I've discussed leaving to my moms but he won't let me go and then makes me feel bad about leaving him. This all happens when my bf is at work as well so of course I want to be alone and unbothered. Ever since I got pregnant i get so easily annoyed to the point where I start to get sick from how upset I am also keep in mind this guy is like 30! I'm only 22 you'd think because he's older he'd be more considerate and give me my privacy but he doesn't! Sorry for the rant but what can I do?! I'm going to lose my damn mind here and end up snapping on the guy he makes me feel really uncomfortable 😣