Friend jealous of my pregnancy?

My former college roommate (who I am still close with) has a 2 year old son with her husband. My husband and I are expecting our 1st child, and we tried a long time to get pregnant. My former roommate responded to the news with 'congrats'. That has been all she has said. She has known for 3 months now and said nothing else. She hasn't asked me any questions. A mutual friend of ours just announced her pregnancy and my college roommate has given her a much warmer welcome. I found out through facebook she sent her flowers & a card when she heard the news. (I got nothing but a 'congrats') Then I got an email the other day from my college roommate that included other friends asking about if we all wanted to get together to 'plan' a shower for the other pregnant friend. I was shocked-I don't mean to make things about me but I am pregnant too and she isn't offering to throw me a shower. I know she has made the pregnant friend aware of the fact she would like to plan her shower. So I know she isn't trying to secretly plan anything for me as a surprise. When speaking to our mutual pregnant friend she told me how happy my roommate has been for her and how supportive. Offering her books on pregnancy, etc. I haven't even been asked anything. I feel very hurt like my pregnancy is less exciting. Another friend of ours told me my roommate and her husband were trying to conceive and my news took her by surprise. I never knew she was trying. I want things to be less awkward and I want to feel like she is being fair to both friends but I don't see how that can happen. I feel so left out. All of my other friends have responded so excitedly and want to be very involved. All my other friends ask me lots of questions. I just don't know why she is happy for one friend and not me.