Here's the thing about being transgender. How you present often depends upon multiple factors. I remember, one day, when I was talking to someone on the telephone, they called me "Madam" and then said, "I'm sorry, are you Madam or Sir?" I knew a transwoman, now passed on, sadly, who said that she was frequently called Sir on the telephone. The sound of a transwoman's voice can be influenced by surgery on the larynx.
I remember one night, an ignorant friend of a friend of my brother's rang up to talk to my brother but he wasn't home, and he asked my brother, later on, who answered the phone, and when he replied, "My brother," he said, "He sounds gay."
But most transwomen who enter a women's bathroom wish to do so to pee or poop, wash their hands and go.