OT: the last two times I’ve signed in to Amazon, I’ve gotten a notice that

We haven’t seen you using this device before. To help protect your account, we just want to make sure it’s really you.

I’m using the same computer that I’ve used for the last year. Am I getting this message because someone’s been trying to get into my account or because I’ve been hacked? I don’t know why I’m getting this message.

edit: I’ve just changed my password.