I'm a horrible person

Yesterday a co-worker of mine returned to work after being on bed rest then maternity leave. As we were catching up, she asked me if I was ever going to add to the work family children. . . That hit like a ton of bricks. I didn't show a ton of emotion though, I held it together. I told her that we have been trying for about 3 months now and still no BFP. She looked totally understanding and reassured me that it takes time and patience.

She is a single mom who got pregnant by accident and didn't even want kids.

Please tell me I am not a horrible person for resenting her. I mean be honest, dont lie to me and cover it in sparkles and butterflies. . . But am I??