What motivated you to have more children?

We're trying for number 2 right now, and I'm also scared....not because of birth issues, but pregnancy issues. I actually had a very healthy pregnancy (for him) and easy birth, but I was soooo sick for almost the whole 9 months. Even on medication - it helped me keep some things down but did nothing to quell the constant, overpowering nausea. The thought of going through that agian with a toddler has me wondering if I'm crazy. But I have always known I wanted at least 2 kids, maybe 3. Besides, ultimately, I just think it's so important for kids to grow up with siblings. It helps with there social and emotional development, teaches them to work out problems, share, etc.