My First Egg!

My first! Laid yesterday. I locked them up last night in the dark and somehow didn't step on it. I found it this morning before I let them out. I'm assuming it's from my Rhode Island Red, Ruby, who was hatched on Mother's Day... so she's what, 22 weeks? I found another egg on their perch, but it was a soft shell and was cracked. I don't know if she's just been busy, or if one of my other two are laying. One is a Brahma, one a Buff Orp, both supposed to be a month older than the RIR, but I think the Buff Orp is younger. She's just now not sounding like a baby chick.