My wife's best friend and maid of honor was pregnant with her first child during our wedding. We only figured it out because we noticed she wasn't drinking at the reception (not showing yet). She only admitted it when questioned, and said, "I didn't want to take away from your big day." That is normal human behavior--not trying to shoehorn your announcement into someone else's event.

"pregnancy hormones can make people act differently"... Okay, then what was her excuse all the rest of the times? Ugh. Narcissist

Sister is a selfish arsehole and needed taking down.

I feel bad for Carly's baby, for being conceived only to fit into her plans. Also for her husband. Imagine being forced to somehow make her pregnant at a specific time so that she'll be pregnant by her sister's wedding date.

I have to admit... My first thought in all this is "that poor baby. I hope they never find out that they were conceived to satisfy their mother's need for attention."

Shutting down the reveal isn't enough, the sister will high jack the wedding anyway. It isn't just the microphone that needs to be restricted, but OP needs to take some measures ( I don't know what or how) to prevent the sister from ruining the wedding. OP needs to uninvited the sister.

Make your wedding even more intimate by telling your family to f**k off. They can all go to Carly's gender reveal. You can use any money you save, by them not being there, to upgrade your honeymoon or move far away from them.

"It's NOT all about you" Did you miss the part where the sister tried to make it all bout her?

You need to set up some sort of defensive measure for the case she grabs the mic and tries to announce something. You could, and maybe should, promise in the invitations that this will be an event without "... some nutcase of the family hijacking it - we're decent people, we don't do such!". Make it clear that this day, her pregnancy has to take second row, if it's being mentioned at all. Don't cave by one millimeter, this day is the day of you and your husband - btw, has she asked him if it's ok for him to have his wedding hijacked? If not, how could she assume he is? - and her numerous days about her, she had and will have. Just not that one day. End of, no discussion or debate required, as this decision stands and won't be revoked. Wedding. You. Husband. Not Sister. Not Crotch Goblin. Simple as that. If she has problems understanding ... is a little slow in her head, which seems so to me ... chose easy words, short sentences, and generally, talk to her like with a 3 yo.

“Gender reveal party” should have been enough of a giant red flag in and of itself. If it’s just pregnancy hormones, then maybe she needs to stay home the weekend if the wedding to avoid any stress or emotions. I’d hate for someone who apparently not able to have common decency y due to hormones be forced into a constant social situation with close family without any escape. She should decide stay home for self-care.

Sister is one of those who must have all attention on her. Anyone else gets that attention she will find a way to direct it back to her. Someone else having attention is anathema to this type of person.

How can OP even question whether she's an AH? Absolutely not. Who TF plans a gender reveal at a sibling's wedding?

NTA. This reeks of Golden Child Syndrome. Sister was so jealous of her sibling's wedding plans that she got pregnant on purpose just to steal her thunder, and their mom is playing right into it. I'd have uninvited her too -- a wedding is supposed to be a celebration for the bride and groom, not a Look At Me party for narcissistic siblings.

Maybe as sis tries to announce, OP should over-announce they are trying to have a baby.

My BS detectors are burnt out from this post. I need new ones.

one of my brides maids was pregnant. only a handful of ppl knew. i figured it out at our friends bridal shower a few months before my wedding. i wasnt strict on bridesmaids dresses i just said this color floor length thats it. my friend ended up returning her original idea and got a dress that had a looser fit to it. wen i asked y she said she didnt want the ppl who didnt kno yet to notice her baby bump. i told her she didnt have to do that wen she asked y and said its me and my husbands day and she didnt want attention on her. i simply responded with "ull see". fast forward to my wedding we did our first dance and then our dj asked for my friend and her husband to come to the dance floor for their 5th dance. the dj then said "happy 5th anniversary from the bride and groom" and played their first dance song. my friend then realized wat i meant by "ull see" and y i questioned her dress change

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The only thing worse than entitled childowners is entitled pregnantists. Everything revovles around their child. Everything revolves around her fat, ugly, belly. You don't really lose much if she's not there, it seems rather relieving to expect to not having to deal with her, her child-making progress or any of that BS. Same weekend, yeah, really ... should have just laughed it off, every time she brings up her pregnancy, and change the subject. "I was thinking of naming it Kevin, ..." - "That's nice. Ok, what dishes should we serve at our childree wedding?" - "But, we're gonna use a soooo unique spelling of it: Kay-veign! So, he's gonna be THE Kay-Veign, not just one of the Kev..." - "... and, when our childfree wedding is over, should we arrange for guests with further travel, should we book a hotel or something?" - "Me, husband and Kev...." - "My first car was a Fiat Panda, to be driven digitally - full throttle or idle, other states of operation didn't really make much sense...".