Is this normal of my friends?

My two bff (one has a baby under 1 years old and the other one isnt married) since finding out I'm pregnant they both separately informed me they were going to start trying, and both admitting they want to be pregnant the same time as me. I kinda feel a bit strange about this, on the one had its an exciting prospect our kiddies playing and growing up together, but on the other i kinda feel like it's my turn... should I stop being all about me and just support them?