Apex domains cannot have CNAME records.
Question and response
Question
dig ehealthmedicine.com. NS
Answer
ehealthmedicine.com. 4 NS ns-1832.awsdns-37.co.uk.
ehealthmedicine.com. 4 NS ns-1668.awsdns-16.co.uk.
ehealthmedicine.com. 4 NS ns-1578.awsdns-05.co.uk.
ehealthmedicine.com. 4 NS ns-1823.awsdns-35.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0