Expecting # 2 20 months apart

Hey ladies, my little one is about to turn 1 next week, and I just found out I'm expecting number two. It's a shock to me since I haven't even had a full cycle since I'm still BF. My biggest concern is how my little one is going to handle everything once the new baby is here, they will be 20 months apart. Do any of you have a similar situation, or have any experience with this?