Friend keeps bringing up wanting to post my pregnancy

I’m 13ish weeks pregnant currently. We told our family we were expecting at 9ish weeks and then close friends from 10-11ish weeks.

I have one friend (who is a mother of 2 - 1 teen and 1 toddler) who is “so excited” to post our pregnancy on her status and socials. In the past 2 weeks, she’s mentioned wanting to do this 3 TIMES. I get the excitement, but my husband and I both agreed we wanted to keep this pregnancy private and off social media until the baby is born. We enjoy the privacy and intimacy of the people who we’ve told knowing. We don’t mind if word gets out to people - this isn’t a secret - but we do not want social media posts of our pregnancy, especially if it’s not made by us.

More context: she’s the type who actively posts MULTIPLE statuses of her kids - especially her toddler - EVERY DAY; what he’s up to, whether he’s slept through the night or not, etc. and I’m the complete opposite. I rarely post anything!

Anyway, how would you go about setting this boundary and having the conversation about not wanting our pregnancy posted by people? I never thought this was something I had to explicitly address with anyone.

Thanks x