Apple Care+
When I ordered my Apple Watch, I didn't get Apple Care+ with it; is there any possible way I can now buy it separately? Thanks for your Help!
To establish whether or not you can purchase AppleCare+ for your Apple Watch, either check online as directed within the webpage linked below or contact Apple. The number to call in the US, for example, is (800) 275-2273.
AppleCare+ - Apple Watch - Apple
I'm afraid that no-one here can tell you "yes" or "no" in respect of your particular circumstances. You are not talking to Apple here - this is a user-based technical support community.