Yours look blue, not lavender/self blue. In my previous post I said mine were lavender, but out of the ones I posted the male is blue and the female is lavender.
I'm a huge sucker for blue birds. :p
I would wait to be positive on genders when your chicks are a little bit older, when you can see more redding or more rows. I do have 2 pullets with slightly wider combs then the other girls, so that could be the case with yours.
That's actually been something I've been watching for my chicks. Herea my current batch, 4 weeks old. First is a cockerel, second is a pullet.
The cockerel has a wider comb with a row of three, and the pullets is slimmer with a row of one.