I forgot to mention this but from here on out we do help with breed as well. Our breed expert is @Chicken Girl1 , so if you would like to know breed she is the girl to ask!
X2, that's a hen. She is just taking longer to start laying, and roosters would already be crowing. She has straight, rounded tail feathers and body feathers, and no spurs as far as I can see.
Looks a little roo-ish.. keep an eye on him/her. I heard that RIR pullets had a black line on their head, your chick doesn't.. but I am kinda thinking that's a myth.