Sorry to crash, but just wanted to add my view
Me and dh were ttc this baby for 3 years. I know compared to some that 3 years isn't long, but for us it was the most horrific time. Being prodded, tested, investigated, treated like a lab-rat, etc.
During the final 18 months (which is when our problem started to really hit home) I used to get so down seeing facebook announcements, I hid so many people. The final straw for me came when my cousin announced her second baby (they had 2 in the time we were ttc) on her facebook status- she knew that me and dh were trying and going through a hard time, but she chose to announce it rather than tell us face to face! I was furious and deleted her immediately. I felt terrible that i'd deleted her, but I couldn't believe how insensitive she was.
Over the last year I found out that several of my facebook friends pregnancy announcements were done so because they'd been ttc for a long time. I assumed they'd magically fallen pregnant, but some people just don't announce their difficulties.
When I got my bfp, I was ecstatic. After the hours of crying, and sleeping with the test on my bedside table (so that I could reassure myself I wasn't dreaming during the night), we decided to tell parents only. A week later I decided that I would announce my pregnancy on facebook. Tempting fate? Maybe, but in 3 years of ttc I didn't get a sniff of a bfp, so the fact that i'd actually got pregnant was worthy of celebration in itself. I have never wanted to upset anyone announcing my bfp, and i've always made a point of stressing how long me and dh were ttc.