Difficult moms

Emily
My husband and I are TTC baby #1. We've been married almost 2 years and together for 4. Both in our 20's. We had some close friends that got married a few weeks after we did. They just found out they're expecting! We're so excited for them! When I called my mom to tell her their good news she completely freaked out and was like "they're so young how are they going to handle this??" Her reaction makes me worry about how she will react when I'm pregnant. Any advice on how to break the news when it's my turn??