earliest age to get pregnant

Hi, I’m new here, my name’s Louise and my Sphynx’s named Poco (male) and Pitta (female), they’re not siblings. Poco is 10 months old and Pitta is 3 months old. I think Poco’s starting to get horny (I don’t know what is the right term for a cat), and I’m not sure if Pitta is ready, so I...