Pregnant Sisters

Hi Ladies!! So my sister and I just opened our Christmas presents to each other over FaceTime and found out that we're both pregnant and due in July!!!! Our due dates are 9 days apart! 
I'm really really excited to be pregnant at the same time, and am so happy that our baby will have a cousin close in age but was wondering if any of you gals have experience being pregnant at the same time as a sister or SIL. How did it go? Was it a fun experience? Did you run into any problems along the way?? These are the first two grandchildren for our parents so it's such a special time!