I COMPLETELY understand how you are feeling. My best friend gave birth when I was on my downreg phase of my first IVF in July, and another close friend gave birth a week before my BFN in September! I had SUCH a hard time trying to be happy for the second friend as she had left her husband last September, met someone else in October and was pregnant in November, having said all her life she didn't want children! And there's me and DH who want them so much and have been trying for nearly 5 years!
I found by taking a step back from it all when I needed to really helped me. I felt extremely bitter and angry about the whole thing and was so worried that it would effectively ruin lifelong friendships, but now I am feeling better about things and am able to see my friends and their babies. I know that one day that will be us to, even if we don't have one of our own, we WILL eventually have that family we've wanted for so long.
Don't get me wrong, yes, I do still feel upset and have good days and bad, but its getting easier.
Do whatever you have to to deal with these things when you need to. If they are real friends they will completely understand, and if they don't, they are not worth having as friends.
Good luck for your test date - be strong.
Love Emma x