I'm not an expert and have never had this breed, but all the Americans I've seen that have red leakage are males. I have no idea about the Lavender.
Rust Red shoulder leakage on an EE is a male trait. 3 row pink comb at only 10-12 weeks is also indicating male.Fffff....That's what I was thinking as well. All 3 that were supposed to be ameraucana pullets have red leakage, even the lavender. Splotchy, too. And red combs.