Hormonal but not Pregnant Yet

Is it just me, or does anyone else get that little hint of jealousy or heartbreak when you hear that your friends are pregnant? Of course I'm super excited for them, but no matter how hard I try it stings all the same. We've been trying for baby number two with no luck so far (had lots of trouble trying for baby number one). And since then it's like every other one of my friends are pregnant, on to their third or fourth baby or whatever. I know I can't judge and I don't know their situations, or struggles. But I can't help getting emotional (in private) that it isn't happening for us yet. Could use some reassurance and confidence boosting.