Not sure if it’s my hormones or what

First I feel HORRIBLE feeling this way and feeling selfish but my boyfriends brother and my friend got engaged today and I’m very excited for them but we’ve been so excited about us bringing our first baby the first grand baby into the family and I feel terrible being selfish like this I just I don’t know feel like our thunder got taken away? Sounds so stupid... and I’ve never been the one to think about “me me me” ugh.. why do I feel like this.

(Boyfriend is wanting to get married soon we always talked about it and we have that commitment)