How do you break the news to friends TTC

My babysitter/friend/occasional drinking partner (she deserves to drink for putting up with my wild child!) is currently TTC.. has been for about five months. It took her three years to get pregnant with her first... had some testing done which confirmed there is some issues with her husbands sperm count. She always comments about her friends or other people who are pregnant before her.  Never seems happy for them. How do I tell her I'm pregnant? I don't know what it's like to struggle with fertility, I'm sure it sucks very bad so I would not be offended if she wasn't thrilled for me.  But what is the best way to tell her? She keeps asking me if I'm pregnant which I just found out today I am.  I don't know what to tel her. I don't want to lie to her. She knows we have been trying to have baby #2... But I got pregnant as soon as we started trying. I don't want to make her feel like crap!