Opinions, Advice, Support, ANYTHING PLEASE

I’m going to try to make a long situation short. I just need something because I don’t know how or what to feel about it. Recently my brothers girlfriend announced to our family on Thanksgiving that she is pregnant. She’s 19/20 and they’ve been on and off for years. I’m happy and excited for them. My husband and I have only been married a couple of months but we’ve been together nearly 7 years and have just recently been talking about trying to start a family even though we’re scared, but we see all these other people our age having multiple children and they seem to make it so why can’t we? I decided to tell my brothers girlfriend that we’re going to try to conceive in the next year and she came to me with “I’m scared if you get pregnant that it will take away from us and our baby.” And “I want our moment of having our first kid to be special.” As well as “I thought you didn’t even want kids right now.” And it has left me feeling like she’s trying to guilt me into not getting pregnant and my feelings are honestly really hurt. She feels like if I get pregnant it’s going to take the attention away from her and her baby. I told her it was absolutely awful and selfish of her to say that to me. Am I wrong? Is she wrong? I’m just really upset.