What do I do?

Me and my partner are expecting our first baby together, we currently live with his parents as we don’t have enough money to move until next year. His mother will not give me any privacy, she constantly comes into our room without knocking, involves herself in our relationship, can’t tolerate us walking around upstairs or making any noise. I am confined more or less to my tiny bedroom. I appreciate them allowing me to stay here but I have zero privacy it’s driving me insane! I can’t be upstairs 2 minutes without her strolling on in. What can I do? It’s making me miserable.