My SIL stole my baby name

I'm sure there's been a lot of discussions about this. I've been struggling with fertility and my SIL had a baby boy yesterday. About a month ago we were sitting talking about baby names and I STUPIDLY said what my future boy name would be (it's been my favorite name since I was like 10). (please don't bombard me with "well you should've never said it, because I can't go back in time"). She said a few names and they were not even similar to mine.

Yesterday she gave birth and to my SHOCK she named him my favorite name. I understand I can't CLAIM a name, especially when I'm not pregnant. But I felt like it's an unspoken rule that family doesn't use it.

Anyways, I'm feeling so hurt. I've cried a few times and I think it just hardens the blow that I'm struggling to conceive. I haven't said anything because she's still in the hospital but I'm feeling so hurt and really disliking my SIL at the moment.

Does anyone have any advice on how to move on from this?

**Edit to Add: Thank you for all these comments! They've made me feel a lot better. Do you guys think I should say anything to her? I keep typing out a text and then deleting it. On the one hand, I know me saying anything won't change it but on the other hand I feel like if I don't say anything, I'll never be able to move on...

I hate the thought of her just getting away with this. I think it's more about the act at this point than the name.