It's Out of my Control, so How Can I Adjust My Reaction

I see pregnant ladies or babies, and do the opposite of what most people do when they see one.  I scowl, glare, silently detest them for crossing my path.  My mind does the why me?  How come I'm not still pregnant?  It's not fair!  (Basically, WAH WAH!)  I can't control the fact that these people exist, so how the heck do I react better?  How can I control MY reactions to them and not be so damn upset?  Seriously, especially to other BLMs, HOW how how can I not be so mad at babies or women who are about to have one?  How can I change my reaction to them?  HELP!