Am I a bad person

My sil just had her baby tonight and while I’m thrilled for her I feel like crying. They weren’t even trying to have a baby they weren’t sure they wanted one. Yet my dh and I have been trying for months now and nothing. I’m trying to not focus on the negative and enjoy having another niece but it’s killing me. I can’t talk to dh about it as he feels his health problems lately have been part of our problem and I don’t qant to make him feel worse