At this point you really don't...it's a wait and see. You can look for things like posturing, larger comb and that sort of thing but it's still a guess. You can also try posting pictures here when they are around 6-8 weeks old and there are people here that are pretty good at telling.
I agree that it's too early to tell at 2 weeks unless you have sex linked chicks which can be identified soon after hatch. The what breed gender section would be a great place to post pics in a few weeks when they older. Here is the link ~https://www.backyardchickens.com/f/15/what-breed-or-gender-is-this