Do I possibly have chickenpox?

It just started yesterday when I was noticing tiny pimple-like red dots on my neck. I then notice more around my torso and back but not TOO too much. Some are itchy. My scalp also has dots on it and they are itchy. There are also some behind my ears, but none on my face, THANK GOD. I'm freaking out. Do I have chickenpox?!?! I asked my mom, and she says she thinks I had it when I was a baby, but she's not positive. HELP ME PLEASE!