My fiance and I had planned to wait a while before telling anyone outside the family since that reveal did not go over well. When my best friend called me on Skype to RSVP to my wedding and wish me and my fiance good luck even though she's never met him.
I guess not having any support from my family got to me, so I ended up telling her. She had the reaction a best friend should have; she was excited, supportive, even talked to me about my concerns. She also talked to my fiance a little bit and gave him the BFF seal of approval. This is why she's been my best friend for ten years.
It's such a relief to have someone to talk about it with, other than my fiance, who knows me and will support my decisions.