Best friend is pregnant

Courtney
My best friend just told me she is 5 weeks pregnant(it wasn't planned). I am so happy for her! But upset that it's not me, as we have been trying since December '13 ( not that anyone else knows this) I literally could just burst into tears! 
The thing is my partner is also a very good of hers so obviously I can't mention anything to him coz she will want to tell him herself.
I just don't know how I'm going to hide my feelings from him when I get home from work!