When we found out we were prego with DS, we waited as long as we could to tell anyone. We had a miscarriage w/ no. 1, and were afraid to say anything. But we had to finally say something because, at the time, DH and I held an annual wine tasting at our house the weekend around Valentine's day. Since I knew I couldn't drink, I figured it would be obvious that something was up.
So I baked some baby related cookies (bottles, strollers, rocking horses...). Wrapped them up and bought Valentine's cards for the grandparents. My MIL and FIL were there with their spouses, but I had to mail my dad's because he is out of state. Shortly after starting the wine tasting, I went and got the packages for MIL and FIL and gave them to them. The cards were addressed to "grandma" and "grandpa" respectively, and signed "love baby (fill in last name) see you in September". FIL opened his a little faster and was pretty calm about it, gave me a quiet congratulations and hug (he knew my MIL hadn't finished reading hers yet). At first MIL was like ????? She thought it was a card from our 2 cats! Until she got to the see you in September part. It took a minute to sink in, but then she nearly knocked over the table with the wine on it to get to me...nearly knocked me over, too! It was pretty funny. Her husband was still clueless, thought the cookise were cute and tasted good...then he looked at them again, and he finally got it! It was pretty funny. Got it all on video, too!
Not sure what we would do to announce a 2nd, if we ever get there...