It's okay to delete this message! Even if you did place the order your order information will be on your Amazon account. If you're unsure if the purchase was legit the safest way to check this is to not click the link in the email and just go directly to Amazon.
You can always double-check the amount at the bottom of the email to see if you remember ordering something for that price.
However, keep an eye out for spoofing emails that may have a large amount to try and trick you!