When to break the news

I've read a lot that says not to tell until you're 12 weeks along because of miscarriages. There is no way I can wait until 12 weeks but I'm thinking of waiting until 6 weeks. I'm 3 weeks 5 days and we've told a handful of people already. Hubby is just so excited! He keeps pressuring me to tell our parents but I still think it's too early. He wants to tell them next week (i'll be 4 weeks 4 days by then). When is it safe to tell?? Keeping in mind my parents won't exactly jump for joy...