This is kind of tricky because my DH and I have slightly different perspective on things. I cannot blame him though. His brother and SIL (now divorced), was pregnant, and they had to rush into getting married. She lost the baby. After that, she has been pregnant 7 more times (she has NO problems getting pregnant, it's staying pregnant is the issue), and finally had a baby girl. After 9 years of marriage, they got divorced. Because of the losses, it made it very hard on the family especially when the oldest family member was going through Alzheimer's (8 or9 years) at the time. So, needless to say, I can see why my DH is a bit reserved and wants to wait, especially since I'm 35. My DH wanted to wait until 3 months to tell his family.
I told my mom the day I found out. I had to tell a couple close friends because they were already super worried when I was complaining about tummy troubles and it was affecting my cycling. They promised not to tell anyone.
DH said to me, "I want to tell my parents tomorrow." I was kind of shocked, but I know he's super excited. He already told a close friend.
We're 6 weeks if it matters. So, I believe it's all about personal choice. My friend didn't tell anyone until she was 5 1/2 months. Another friend didn't tell ANYONE until she had the baby. No one knew, except for those that saw her. She never posted pictures on FB and such. I couldn't blame her because she was 45, and this was her first child.