Fairymagik - its not that people TTC resent pregnant women its just that they see something they so desperately want and sometimes get upset, one day it may come to us all.
Jenni - Being as i am dealing with infertility myself i have experienced friends telling me they are pregnant, one this week told me she was 5 weeks pregnant and to be honest i was hurt but also happy for her, it did make me cry because i thought that she was so lucky and i wished it was me but as i said to Fairymagik - it will come to us all one day. If she is a good friend she will be happy for you, tell her in the gentlist way and ask her not to get upset and tell her you are all ways there for her, that would help me
I did have a friend who hid her pregnancy from me because she thought id hate her but i would never be like that, she hurt me more by hiding it and lying to me (i asked her to come to new years eve party and she said she had plans, then she had to tell me because another of our friends went round to see her)
Either way i think she will respect you more for telling her and i bet she will be so pleased for you, just tread gently and good luck