How many devices are signed into my Apple ID? Or accessing it in some other way I have definitely been hacked
[Re-Titled by Moderator]
It's unlikely that you have been "hacked." If you believe your Apple ID is compromised, https://support.apple.com/en-us/HT204145
It is highly unlikely your iPhone has been hacked.
Your Apple ID on the other hand is another matter entirely. You can use the link provided by muguy above to check your Apple ID.
On your iPhone, you can go to Settings->Account(top of settings) and you'll see a list of devices your Apple ID is signed into and see if you don't recognize one of them.
Outside of that, you may want to explain why you think you have been hacked. What is happening that makes you think this?
I believe my iPhone has been hacked
