Congrats Blankets I wanted to wait til after 12 week scan initially, having had early mc only a month before which we'd told no-one about, but ended up telling my immediate family about 8 weeks along as I was in hospital for somehting else and the whole bloody place knew and kept blurting it out. My mum and a sister came to visit me so I had to tell them in case someone said something while they were there.
Then told dad and other sister next day. Swore them all to absolute secrecy and to keep everything offline until I said otherwise.
Didn't get a chance to tell OH's family until after the scan - had planned to around Xmas but I was so ill that hardly left the house to visit them, except for when we had OH's son with us. Eventually told them after the scan, but I was furious as OH had told his sister, who had told his brother, and his brother told his dad before we could. Obviously, he had failed in the whole 'make sure they are sworn to secrecy' thing.
I was really upset by this as my family are far away and OH's family have always been supportive. He initially wanted to tell them by text, til I expalined that it mattered to me, as well.
Still, news still offline, which is the main thing to me. Once have told both bosses at work (one down, one on Tuesday) I'll feel more relaxed. I'll be 15 weeks on Monday.
Do whatever you feel comfortable with - and good luck!