Persians run on their own clock when it comes to breeding, and patience matters here more than in almost any other part of cattery management. Rush this stage and you'll pay for it later, one way or another.
Around 21 days after breeding, "pinking up" — the nipples enlarging and turning a brighter pink — is an early, informal sign in first-time queens. It's less useful in an experienced queen, whose nipples are already prominent from prior litters. A gentle abdominal palpation by an experienced hand can pick up pregnancy somewhere between 2.5 and 4 weeks. We deliberately skip routine ultrasound as a matter of practice — it minimises stress and vet exposure for the queen, and honestly, ultrasound kitten counts are notoriously unreliable anyway. Some early embryos get naturally reabsorbed, and a lower count later on can cause needless alarm over nothing.
Beyond colour and type, review both cats' health-testing status (Chapter 16) before every planned pairing — particularly PKD status, since it's autosomal dominant and testing both parents is the clearest way to avoid producing affected kittens.