You got your Valintine's Heart! Wonderful!
Tell who you want to tell! The advice I was given, which it so true, is to tell those people who you would want around you to support you if soemthing did, heaven forbid, not go as planned.
Also, my mother always regretted not telling her grandfather that I was going to be born because she was waiting until 4 months and then never had the chance.
Tell the people that will add joy and support to you!
I am so very thrilled for you! All the blessings!