I don't think it's bad luck, but I still wouldn't do it.
We're in a similar boat, we weren't sharing our list before we decided because of how outspoken and pushy my family is. Once we decided for sure (about 2 weeks ago) we talked about telling people, but after discussing it and talking with family members everyone agreed that there's a short time left and my family says they think it's fun guessing and finding out when she's born.