Not sure..

So I'm currently pregnant with my 3rd & last child. Getting pregnant comes rather easy for my husband and I, and I'm very grateful for that. However, one of my best friends is struggling with infertility while trying to conceive her second child. Her & her husband have been trying for at least 2 years. I feel extremely guilty for being pregnant. I know how much her infertility hurts her, but she has always tried to remain upbeat around me about my pregnancies. 
For those with infertility issues: how do you wish your pregnant friends would be around you? I am constantly trying to avoid talking about my pregnancy around my friend because I don't want to hurt her feelings.. Am I over thinking this? 😞