How would you feel ?

I have a friend who I see once every few weeks, I've known her all my life, best buds if you like, well she has been really eager to see me past 2 weeks, I have a really busy lifestyle atm so had to cancel a few times, but she's coming tomorrow & I have this feeling she's going to tell me she's pregnant. Now, not to sound selfish, but I hope she is kind enough in a way not to boast about it or make a specific journey to come & see me to tell me this. Only we have been trying for 4 years & it's hard for me to show happiness straight away when someone tells me their pregnant. I have to process it first & then I can show my happiness for them. As all I can think about is why not me "/ how should I deal with this if she does as I don't want to upset but she knows the deal with me, would you be pissed ?