Has anyone’s friendships changed since becoming engaged?

I have a friend that I’ve been best friends with for 9 years. We met at the same time I met my FH since she has children with and used to be in a relationship with FH’s stepbrother. We were all close and remained so even after her split with her ex. She is now with someone new and things seemed normal till I got engaged. I was super excited to tell her since she’s been my best friend through my entire relationship with FH, however not a second after I told her I was engaged her whole demeanor changed. She told me that she hopes I don’t plan to marry this coming year since she thinks she may be pregnant and she doesn’t want to be pregnant in a BM dress also that she hopes we don’t invite FH’s stepbrother because she “doesn’t know if she would come to the wedding without her current boyfriend” because apparently the two men don’t get along. Any wedding ideas or dress pictures I show her or anything wedding related at all is shot down and quickly turned back to how she’s pregnant or her issues with her boyfriend or pretty much anything related to her sob stories and not me or my special day. She’s always been my person and never been like this before, how do I handle this? This situation is really putting a damper on the whole experience of being engaged. Any advice is welcomed.