Is it tacky to announce at the wedding we’re pregnant?

It’s our wedding. We’ve recently found out we’re pregnant. I’m currently 7 weeks pregnant, and we’re getting married in 5 weeks time, so I’d be 12 weeks. My fiance thinks we should announce it at the wedding as his family will be there so we can tell them in person as we don’t want to announce it on social media.
Update: No, we’ve had the wedding booked for 10 months.
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