Confesstion - I still have bitterness

So I found out yesterday that my sister in law is pregnant. Without trying of course. Even though I'm pregnant, this still stung so much. I'm still bitter that people that seem undeserving can get pregnant naturally and we had to spend over $12,000 to get to this place. The most annoying part is that I know my twins won't receive as much both in attention and in physical things because my SIL is "less fortunate" than us. Which I understand, but it doesn't make it any easier. I thought once I was pregnant this would pass but I guess not.