LOL I know it is hard maybe you have the same sex is the reason your having trouble. Since I had 2 ducks and a drake hatch this time it was pretty easy to tell by around 5-6 weeks the drakes just start growing so fast they leave the ducks in the dirt so to speak,. Them thick legs and setting wider apart under neath them to is a big give away.I am such a newbie that even though mine are about 12 weeks I still don't know!