gmail recognises dotted addresses, so if your email is samanthastone @ gmail, you can also use samantha.stone @ gmail, or any variation thereof.
What I can NOT tell you is if Wikitree recognises the dotted address as the same, or different. Most forum software cannot tell that they are the same address, so treats the dotted version as a different one. (Trust me, I have had more than a decade of dealing with dotted gmail addresses.)