they will flower regardless of schedule.. most people including myself use a 20/4 or 24hr schedule.. Especially in the early stages to promote as much vegetative growth as possible
She looks healthy enough, but with the purple on it's hard to tell the real color of the leaves. You usually know to start adding nutrients when the bottom leaves start to get lighter green
Your irregular 14/10 light schedule may be the reason it flowered early, but there's no way to know. Usually they start flowering around week 4-5. You should have at least 18 hours of light with autos.