I have one female pastel that I bought as a male. She was probed to 6 on both sides by the breeder in front of me, but when I got home I couldnt pop her (she was about 200g at the time). No one else could pop her either, so I decided to grow her up as a female. 3 years later she gave me a clutch! Seems like there are some females that probe a little deeper, so I always pop to confirm when they are in that window.