sharing the news with a friend who's having trouble conceiving

ladies, I want some help/opinions on how I go about telling one of my closest friends I'm pregnant. basically, she and her partner have been trying for 3 years with no luck. I feel bad because I thought it would take longer (we often discussed it) and I fell pregnant on my 2nd month. I am super worried she may go distant on me or that it could add a sour note (even temporarily) to our friendship. It's just making me incredibly anxious, she is the person I am most worried about telling! (just to say, I'm sure she will ultimately be happy but it just makes me sad to think of what she's going through).