J.K.
I'm pregnant with #5 and my children are the same way. Especially my girls ages 9 and 14. I had a miscarriage a year ago so they constantly worry about me. Especially in the early stages of pregnancy. I just kept their minds at ease and talked about it when they brought it up. I've tried to stay cheerful and excited so they wouldn't worry so much. It has helped me too since I was worried also (still can be since I have 2 months to go). I also try to take their minds off of the worry by not only getting excited for the baby but also doing other fun things. Good luck to you and CONGRATULATIONS!