Accidentally entered a girl's /men's rest room

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It happened to me about 4 years ago when I'm at the second floor of our laboratory building, I use the rest room in the first floor every time I have my class in that building. One time we have a review at the second floor and I decided to go to the rest room maybe because of instincts that after going out of the room I'll just have to turn left to go to the men's rest room. Without thinking that I'm at the second floor of the building I rushed to the girl's rest room and I'm feel so nervous that they might scream because a man entered there rest room. I really can't forget that day. lol