feeling bad about feeling....well, bad

My husband and I have been trying to conceive and it is not going as hoped. My (younger by 16 months) sister is 13 weeks pregnant with her second baby and my cousins will be over today to announce to their pregnancy. I have so much guilt that all I feel is pain, jealousy and resistance to all of this news. I am happy for them I just want the same thing for my family. Does anyone have any suggestions on how to better deal with my feelings/mental state? I feel awful that I have these thoughts and emotions attached to people I love so much.