Advice on not being jealous of my pregnant cousin

I'm 28 and have PCOS my husband and I have been trying for a baby for nearly two years (I'm starting Clomid soon yay!). My 20 year old cousin who also has PCOS is about 4 months pregnant. It's been extremely hard to see her at family events and I find myself being really petty and critical of her after them. My family is really close and I can't bow out of upcoming events like Christmas. Can anyone give me tips on not being so jealous about her getting pregnant without trying?