Opinions please (moms with difficulty TTC)

My best friend from high school has been TTC with her hubby since they got married 3 yrs ago. I have since had my son and am now pregnant with #2 with my hubby. For moms who had trouble TTC, how should I approach telling her about #2? Should I tell her before I do the formal announcement or just make the announcement and not say anything specifically to her? For #1, she told me she cried for a couple weeks afterwards. I don't want to out her though that again. I just don't know how or what to say.