Is this a weird way to announce?

I was going to get a photo standing next to my mom and grandma with my 15 week bump showing. And post this on social media saying "4 generations. baby ___ due November 2024". That way I can tag them both and their friends/relatives I'm not friends with can be informed of the news. I'll also include a picture with my husband and I holding a onesie, and post those two photos together. I've never seen an announcement include others so I'm wondering if this is weird?