Best friend is using my fav baby name

I feel like I might sound like such a bad friend here but I can’t help but being upset. I have been best friends with this girl for 6 years and we have been with each other through everything. Over the last year we both opened up that we were thinking of trying for a baby with our husbands, we were so excited about potentially having our babies at a similar time. In the very early months of trying we were discussing baby names, and I told her that if I had a girl I already had a name planned for years, she asked what it was and I told her. Well fast forward and she’s now 5 months pregnant with a girl. Yesterday I went on her instagram where she had posted an embroidered baby grow announcing the baby’s name…it’s the name I told her I wanted, same hyphenated name and everything. I messaged her and straight up said that she had used the name I had told her that I wanted for my name, she told me that she loved it when I told her and figured that since she was pregnant first it was fair that she could use it. I know it probably sounds so stupid but I loved that name and I am so disappointed that now I can’t use it. Am I just being petty?