Yes. If you're penis or testicles are growin rapidly, you notice underarm or pubic hair, you're getting acne, you can ejaculate, or you've noticed rapid height growth, you've started puberty!
It's unlikely that you'll see most of those happening at the same time when you start puberty. You'll probably see one or two, maybe 3, and not notice some of the others...no big. You'll probably be anxious to see everything happen NOW and FAST, but it's not gonna, because you have to wait it out and ride puberty!