How to Cope with Others Pregnancies in Your Face

Over a year of TTC with no luck. It was really hard when my sister in-law was pregnant, but at least I didn't see her all the time. Now my coworker is pregnant and is always talking about it and her previous pregnancy. She's 4 weeks from her due date, so she is very visibly pregnant and always seems to be rubbing her belly and such. I rationally KNOW that these are not attacks on me or anything and she is happy and excited. She's not doing anything unreasonable at all!

But I still get so sad every time she comes around. One time (the day I got my period) after she left my office I broke down in tears I was so sad.

How do you lovely ladies cope when you can't escape others pregnancies? At least when I see Facebook statuses about others pregnancies I can scroll past. But with her I can't tell her not talk to me or anything. That would be insane and unreasonable. I don't think I can even ask her to tone it down. She knows I'm trying but since she hasn't struggled like we have, she doesn't understand how upsetting her actions are. Which, I understand. But my lizard brain is still depressed and doesn't listen to reason.

Uhg, advice?