My Cat Scratch

My boyfriend and I got two kittens named azul and julio and azul was sleeping on me and being purrfectšŸ˜‚ (back to the point) and my boyfriend barge into his room and scared azul and he stuck his baby claw into my arm and there ended up being bruising. Is it normal? ( I haven't had a cat in almost 10 years and never had one scratch me)