A close friend at work has been trying for over two years. We're in the same age group (29 and 30). My husband and I started TTC about a year after she did. It took us about nine months. She has been going through tests, procedures, injections, etc. in these last few months in order to conceive. I would never wish my baby away, but my heart breaks for her every day. As I've been getting bigger, I've been feeling more and more guilty.
During a stretch with difficult cycles and lots of frustration, my best friend got pregnant (very quickly). I felt so much envy, jealousy, and anger at my own body and her (I found out in a less than ideal way). I could never talk to her about fertility. It came so naturally to her that she couldn't relate to me at all. She said a lot of unintentionally hurtful things as I became more and more panicky. I stopped opening up to her about personal stuff. I'm still working on my relationship with her in this respect. Even though we're both pregnant now, I still feel a block there in our rapport. I haven't disclosed a lot of things that are going on in this pregnancy and my marriage. She already has one child and I don't even feel a connection to her on a maternal level as I do with other women.
I think this experience helped me have the empathy necessary to relate to this work friend. We've since maintained our friendship although I know that she feels uncomfortable sharing some aspects of her journey to conceive a child. I don't push; she knows I'm there for her in support and I'll never utter those dreaded phrases people think are helpful ("Maybe if you just relax..." "I wish I could give you some of my fertility" "Being pregnant sucks/you're lucky you're not pregnant, it's awful").
I can't speak for all the people in your life, but I know that this friend shares my happiness. I don't make my pregnancy the center of all conversation and let her take the lead. She's constantly in my thoughts and I know if our situations were reversed, she'd be an even kinder friend to me than I could ever be to her. I look forward to her time, when it's finally her turn.
I hope that you can enjoy your pregnancy in spite of the feelings of guilt. If you made it to the end of this monster, all of this is to say that I'm right there with you!