How to tell a friend I'm expecting

I have a very good friend who has been TTC for several years now with no success. My husband and I just got married in April and we found out we were expecting a week after the wedding. Im 10w6d. I'm going out with this friend next week for girls night and I'm not sure if I should say something or wait a little longer. I want to be excited about baby but don't want her to feel like I'm rubbing it in at all...any suggestions about how/when to approach her and what to say?? Thanks in advance for your help with this sensitive subject!