I doubt you are the only one. I personally think it's cute that you want to make sure you don't do anything to jinx it. It kind of shows how much you are valuing what you have going on.
And congrats! The more love in the world the better.
Same as you. I like to keep quiet and enjoy it all to myself. It's especially nice when both of you keep quiet then you have a secret to share. You can't jinx it, but you can protect it until it's fully grown.
I felt the same way when I started falling for my DH! We weren't broadcasting it all over the place, so imagine people's surprise when we got engaged after a couple of months or so of dating. It's a wonderful feeling. Enjoy it!
P.S. I don't think it's too soon. You can't help when love finds you.