Rainbow baby's after a 2nd trimester loss

Betsy
It's been a week and two days that I had to deliver my baby boy whose heart stop beating at 17 weeks it was unexpected no one understand what happened because lab work was normal and all the pass Ultra sounds were normal. I won't find out about the autopsy until the 16th is when I see my gynecologist. After your loss when did you try again for the rainbow baby how long did you wait. We miss our little guy but we are ready to try again but still have that fear that it will happen again when everything was going so well we have hope because we already have a 5 yr old daughter. I've been told it's good to try again right away. And that I probably waiting too long for baby number 2