Email stating my Apple ID is being used in Germany.

Check who the email is from, and does it have any spelling or grammar errors, or dodgy links in it ? See :

Phishing and similar emails : Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

Genuine iTunes emails : Identifying legitimate emails from the iTunes Store - Apple Support

Check your device list to see if there is a device signed in that you don't recognize. You can remove the device using the steps in the article below. If you find one, change your password.

Apple ID device list -Check to see where you‘re signed in

 Apple ID Password Change

 What to do after you change your Apple ID or password - Apple Support     I suggest doing this before you change your Apple ID or password.

You are welcome. There are a lot of scam/phishing email these days.