Being a good sister is hard sometimes

My sister is pregnant. Again. Not the married, mother of three, but my very single 30-year-old-not-even-a-boyfriend-completely-mentally-unstable-sister. This is her second pregnancy, but it will be her first child...
She was on birth control...He wore a condom...
Meanwhile, Michael and I have been trying for over a year now and we've had nary a scare of impregnation.
Not that I'm not excited for her (did I mention she lives with her best friend? She doesn't even have a place of her own!). No, really, I am excited.
The last time this happened she really struggled, and at the time she made a tough decision that was right for her at the time, and then she grieved for over a year. When my other sister got pregnant with her third child, she really broke down. In fact, we all worried about whether she would make it to another day.
Then yesterday she called with the news.
I pulled out the book again, "What to Expect When You're Expecting." I thought I would be reading it for me, but I will read it for her. And I will try to support her and be there for her and not be jealous. And I will try to not think about why two loving, financially independent people can't get pregnant but my sweet, but crazy, sister seems to be the most fertile woman on the planet. And I will try to remember that I have other things going for me right now...And I will snuggle with my own babies, furry angels that they are... And I will try not to get mad when she steals my baby's name... And I will love and coo over Baby Lucy when she comes into this sometimes unfair world on December 10.