I'm pre-T and I already have a small adam's apple, my voice isn't super low or anything though. I think it's just because I'm very skinny and my neck is very long and slender so it pops out. It's only slightly noticeable unless I tilt my head back, then it really pops out. I know a lot of cisguys like that, you only see it when they are stretching their neck. I've seen girls with them before too. So basically adam's apples aren't a good determiner for sex.