Obviously I can't say for sure, but in looking through scan pictures and gender guesses over the last couple of months trying to work out what I'm looking for. And also going through the "confirmed boy/girl" threads, I've seen girl guesses turn out boy, but not many that have had all boy guesses turn out girl. Usually if its an almost even amount of guesses it can go either way, or if the whole nub isn't showing or something like the leg is in the way, but if you have had almost all boy guesses I'd say chances were quite high. Did you post it anywhere else? Like in-gender or genderdreaming. There are techs on those sites who can guess and are usually quite accurate.