stepdaughter is upset

Since I lost my baby at 17 weeks, I have been making blankets for babies. Babies that my friends are having, my nieces, babies in the hospital. I plan on donating them. 
My stepdaughter recently told us how depressed she is since my due date is getting closer and has talked to her mom and dad and recently told me yesterday that she just wished that we would try again. I put myself on birth control to prevent pregnancy because of another one happened there's a lot involved for me to retain my pregnancy. We each have children from previous relationships and the baby would have been a mixture of us. 
I don't know what to do because I want to try again but him and I have that fear of
Something happening.