[26-year-old male] with [25-year-old female]

I'm a 26-year-old man, and my girlfriend is 25 and currently pregnant. I've been doing a lot of housework, like washing dishes, doing laundry, and cleaning daily. However, she feels I should contribute even more and take the initiative to do tasks without her needing to ask me. I’m a laid-back guy who likes to help, but I need guidance on what to do to avoid overstepping or doing things improperly. I enjoy playing video games, but she wants me to cut back on that, and she often finds little things that upset her. For example, if I accidentally drop something on the carpet, she reacts as if it’s a huge catastrophe, while she seems to brush off her own minor mistakes. I also take care of her dog, feeding it and walking it, but I still feel overwhelmed. I’m feeling really low and have even contemplated harming myself, although I don’t want to leave my child to grow up just with her. The situation is complicated because I have nowhere to go. I've invested all my savings into the house we live in, and my parents have distanced themselves since learning about the pregnancy. I really need some advice on how to navigate this tough situation.