How do I......

Jenny • Mommy to 2 beautiful babies. One in heaven and one on earth.
Hey moms!
How do I talk my so into trying for another baby?
Let me give some background. 
I was diagnosed with PCOS at 17, and spent 10 years trying toconceive. 
In September 2015 we had a baby boy who was born 15 weeks early, due to incompetent cervix, with a lot of medical complications. He spent 6 months and 10 days in the NICU before he passed away.
Fast forward 8 weeks to the day from when he passed away, I found out I was pregnant. Our daughter will be 5 months in a week.
I don't want our daughter to grow up with out a sibling around. I know she has her brother watching her from above.
I had a cerclage placed at 14 weeks with our daughter, and during my pregnancy. I had no dilation, my cervix actually got longer.
So is afraid to take a chance because we have our daughter.
Help!
Picture for a smile!