FWIW my friend; even when it was clearly 20000% obvious Stells was all boy at my 20wk scan I STILL held out hope they were wrong. Dh used to ask me if I was thinking it might fall off in utero and Id give birth to a girl............and optional extra accessory Itd be harder not to wonder if it were a girl because it definately is more likely a penis can appear magically at birth than fall off and disappear.