I was reading all kinds of threads like this recently to try to get some advice. I was at my previous company for over 5 years and wasn't necessarily looking to change companies. Me and my SO wanted to try for our second after my birthday in January, so we literally tried just that weekend. But then that week I became interested in applying for this job at a new company. So we decided that it would be better to wait and see how this goes, and if I got it, we'd wait another 6 months to a year to TTC again.
I interviewed and everything went great and I got the job! But then of course... I found out I was pregnant right before I started. It took us almost 9 months of TTC to have my dd, so I was so sure it would take a while to get pregnant again. Nope - apparently all it takes is once! LOL! So I started the job pregnant and was so so nervous to tell my boss.
I told her last Friday - I had only been here for 6 full weeks - I seriously had butterflies in my stomach. She is a mom of 2 younger boys so I was glad to have that in my favor. Her reaction was so much better than I hoped. In the back of my mind I knew she'd be okay with it, but I was just picturing her being upset that her new hire is going to be gone for 3 months. But she was happy for me, she said congratulations, and then we ended up talking about babies and pregnancy for over an hour! It turned out we actually had A LOT in common. It was great and I felt so much better. She said the timing is perfect too because I'll be out from October - December and the end of the year is much slower.
It felt so good to get that weight off of my shoulders. I didn't want to wait until I was like 20 weeks because I felt so bad already hiding this from them. I wanted to give her as much notice as possible (after the first tri) so it wasn't a surprise and then them having to scramble with figuring out what projects to take me off of and have to give to others. This way she knows now and she can give me projects that won't overlap with that timeframe. She was also super nice and said she's really flexible with me leaving for appointments and if I'm ever feeling sick I can work from home. I'm so relieved.
Sorry I know that was a lot more than the original question, haha, but wanted to share my story.