Since you are a bio male, you won't be getting pregnant. Talking about that idea really just makes the conversation more complicated.
When your mom talks about her relationship with her mom, then the extent she brings it up is fair game -- and I think you can use that to your advantage. She knows it hurt to be told to dress differently than she wants, and she should want to be happy and not suffer like she did. In a way, her talking about her own mom in that way may indicate she's relating to you, but if she's telling you "no," you need to explain why her showing support is the right thing to do. And it might be good to say that if someone gives her trouble concerning your clothes or your identity, you'll stand up for her.
I'm not sure what you mean by "but will I be able to leave the house because of these comments?" Or you talking about simply going outside with your desired expression, be allowed to "move out of the house," being forced to "move out of the house," or something else?