I'm so glad you started this thread.
My original plan was to tell dd and "the entire internet" right away but keep it under wraps offline until the 12 week mark. I'm at quite a risk of miscarriage and also fairly emotionally sensitive because of non-pregnancy related issues so I'd just as soon avoid negative remarks as long as possible.
The problem was that dd's bf was in the house when I tested, and although I love him dearly and consider him family, I want to have some time where JUST she knows and then maybe have him be the first person I tell at the 12 week mark.
I've also needed that female bonding pretty badly. I've been staying off of Mothering dot com for awhile because I was very close to my 1000th post and I wanted to either (a) save post #1000 to announce my bfp or (b) for pete's sake, stop hanging around parenting forums and dwelling in the past if I was going to stop TTC since my only child is a grown woman.
I've racked up over 30 long-winded, chatty posts here since I found out and I've been just as bad on the small board I moderate and another baby board. I usually work nights but had to do a day shift yesterday and there was no way I was going to tell dd on the IM.
I did tell her that I "had something important to tell you but it's not the right moment" in case she google-stalks me and finds out on her own. She's the skeptical one who thinks it's okay, even necessary, for me to try one last futile time, but she thinks that I'm too old to get pregnant. I don't think words are going to do it for her; I ned to buy another test to show her.
So now I'm thinking about waiting until Monday, when

is due, so that a double-line test will be easier for her to read.
As far as other family, all we really have is my mother, who is 72 years old and fairly fragile. She may or may not be coming out for a visit this month (she and I live on separate coasts of North America) which will be WAY to early to tell her, so I'm paranoid about telling anybody local until after she goes home again for fear of having someone come up to us while she's here and start in with the "How are you feeling? Are you SURE you're only a month along? You're big as a house! Do you think you're carrying septuplets?"
I don't think there's anything weird about wanting to keep your sweet secret just between you and dp at all. In fact, as the mother of an adult daughter, that's one of my favourite memories of pregnancy.
My breakdown is that Phoebe only lived to ten weeks gestation and only me and her father knew about her.
Phoenix's father knew but I didn't really tell anyone else. If people asked, I was honest, but I rented an apartment at 8 months while wearing a heavy sweater and an oversized raincoat and the property manager didn't ask so I didn't tell.
I told dd's father right away and didn't tell anybody else until my wedding when she was 5 months along.
My mother went in for some very serious cancer surgery and it annoyed me that I kept having intrusive thoughts about a late period, so I bought an HPT to get my mind off it. I was on the phone with her while I was waiting for the results, so I sent dd into the bathroom to tell me if the little spot had turned pink (positive result) or stayed white (negative result). When she came out and said it was pink, I practically called her a liar, put down the phone, and checked for myself and she was right. It was so fun having just us three generations of girls knowing for a few hours before we had to tell exy.
I had a possible chemical pg last December and I showed both kids the pee stick. ds saw the line and dd didn't.