need advice

Laura
I have a friend who has had several mc and still borns and lost a child at 15 weeks old. Because of her poor health now cannot have anymore children. 
She has ptsd and at times cannot cope with seeing posts on fb etc about pregnancy and children. 
I have just started ttc and if and when I do become pregnant I am wondering how best to tell her. I won't be posting on social media about it, but I have family members who would even if I ask them not to. I would hate for her to find out that way. I want to tell her myself. 
Due to my ADHD and anxiety I am not great with getting my point across and sometimes I say things that may sound rude and I don't mean them to be at all.