When to announce pregnancy news?

How did everyone announce their "were pregnant" moment? I told my close family over this weekend since they were in town so that it could be in person but now I have to decide when and how to tell my husband's family. I wanted to wait until the first ultrasound and make an announcement that I could mail everyone and have them skype while opening for reactions but now I'm not sure that's good enough.. It will be their first grandchild. And I'm worried if I wait until then (about 4 more weeks) that my family will start slipping the news and I want it to come from us first.. Ideas? Pictures welcome :)