Zoe, you have brought a tear to my eye reading how you told your OH!! That was wonderful!!!!
I told everyone straight away, can't keep a secret me! Everyone at work knew we were trying anyway, I got my BFP on New Years Day and then told work in the first day back. I had already shared the good news with the girls on here. We told family straight away as well. Due to my job, I had to change my role after having a risk assessment, so told other people as and when they asked why. I also looked grey and felt sick for the first 3 months and it was nice being able to explain why I looked so awful. I also wanted everyone to know in case the worst ever happened.
The down-side is that someone at work commented that I seem to have been pregnant forever. Thing is I told them when I was 5 weeks pg, instead of the normal 13. I'm not superstitious at all, so don't agree with the not telling people in case anything happens.