I personally think its unfair of a friend to be like that towards their friend.I know it must have felt awful for her seeings she is trying to concieve,but really ,she should still congratulate you from the beginning and try and hide her frustration and not make you feel so guilty.It isnt your fault and you shouldnt have to stop what your doing in having a child because of this.

I have a Friend who has been trying for 2 years and still nothing,but Congratulated me when I become pregnant with my 3rd,and I can understand her frustration and being upset.It must be awful for woman to try and try and not get what they really desire.

But you shouldnt feel guilty,This should be the happiest moment for you.