Gender reveal stick

So we have been trying for 3 years to conceive. I finally showed my twin boys, who are 6 years old.. several weeks ago. Now I'm 15 weeks. I'm not sure who is more excited to find out the baby's gender.... my boys keep asking if there's a stick to tell me we are pregnant, why can't it tell me if its a boy or girl!?!?!? I'm thinking the same thing!!! I know they have sneak peek and such, but that's expensive and it wasn't covered by our insurance. You guys know how hard it is to keep a child patient, let alone 2..