Hoping for a baby after ectopic

I hate TTC these days...I have one child that i gave birth to when i was 21...my husband and i didnt start trying again until after my sons 3rd birthday, and the first time we tried i got pregnant, but turned into an ectopic. I had to have one fallopian tube removed because of it...then 4 months later got pregnant and it was a miscarriage. My husband then deployed and got back in may. Since then we have been TTC again with no such luck. How is it that i can have a perfect pregnancy and birth, and then have an ectopic and all my hopes of having another one are gone? I have 10 days until AF is supposed to come and im praying it doesnt. Were doing everything were supposed to, so why shouldnt we be pregnant??? Anyone been in my position and eventually had a healthy pregnancy and baby? I need some inspiration to keep trying...