Glad to hear all went well today!
I agree with Sarah, you are not likely to be confronted by women in there. Looks and gasps do not hurt. Just act as if you belong there, and you do. If someone makes a face at you, just look at them like they are insane. I would say that 99% of the time, any woman in the bathroom is either peeing or fixing their makeup. They probably won't even notice you. If I saw you on the street, I would have no doubts that you are female. You rock it!