Difficult situation?

I’m currently pregnant and deciding how I’m going to tell my best friend,this would be my third, she has been struggling with infertility and I want to share the news with her but don’t know how exactly to do it without hurting her, she told me she got so hurt when her sister has another baby and was upset I don’t know how to tell her,without hurting her?

Update, I just told her I sent her a message as many of you suggested to give her some time to be hurt if she needs to,she answered back and of course she was happy she’s a great friend but I understand if she does decide to back away and need space she can do so,I’ll be here when she’s ready to!