Apex domains cannot have CNAME records.
Question and response
Question
dig nathancmatthews.com. NS
Answer
nathancmatthews.com. 5 NS ns-199.awsdns-24.com.
nathancmatthews.com. 5 NS ns-1397.awsdns-46.org.
nathancmatthews.com. 5 NS ns-733.awsdns-27.net.
nathancmatthews.com. 5 NS ns-1747.awsdns-26.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0