Pregnant Coworkers

So when I got pregnant I was the 8th girl at my work pregnant, then I miscarried. It's been hard watching them grow and deliver, but I've done it & I'm proud of myself. Now what's been hard for me is new pregnancies. Like one girl, this is her 5th kid and she complains about the 18 month old all the time and they're not married. Or the other girl, this her 6th, she has a hard time supporting the 5, she's going through a divorce, and this baby belongs to someone other than her husband, she's 20+ weeks and hiding it. I can't even stand to look at them, going to work takes all of my strength. My husband and I are trying again and all I'm getting are negative pregnancy tests. How do I find the strength to go to work? I don't know that I'll ever be happy for them, I just don't know that I can be the bigger person here when I feel like they don't care about my feelings when they're LOUDLY talking about how they feel, almost rubbing it in my face.