Trying to conceive after Ectopic Pregnancy

Crystal • Im 28. My fiancé and I had an unfortunate EP on 2/9/14. I have a beautiful 7 year old baby girl Mia, a 2.5 year old boy Maison and a 1.5 year old boy Manning. We are also expecting another girl on 9/5/17!!!!
I'm scared it'll happen again. Any suggestions on what I can do to to prepare my body for a healthy pregnancy this time?