So sorry for your loss, having been through it myself 18 months ago, I can totally understand that you have a lot of questions (and emotions) at this stage. I found the Ectopic Pregnancy Trust forums very helpful.
Although DH and I had decided to start trying for a baby, I had no idea that I was actually pregnant. The entire thing was a huge shock - from the initial horrendous pain, collapsing and then being taken to hosp, being told I was pregnant, then surgery....
I had a ruptured tube, which was removed with surgery. Physically, I recovered quickly but, mentally/emotionally, I found it tough.
I, too, had lots of anxieties and worries about future fertility. But, just 3 months after deciding to start again, I fell pregnant. I'm now 8 weeks pg, and the baby is definitely growing in the right place too, which I am thrilled about.
After an ectopic pregnancy, you can get early scans at the early pg unit at hospital. Mine was able to fit me in very quickly after a positive preg test, so much so that the first scan saw nothing! This will confirm that everything is in the right place, and put your mind at rest.
For now though, my main advice would be to try and be kind to yourself and look after yourself. Although they told me that I'd had major abdominal surgery, I did physically recover very quickly. Because of this, I probably went back to normal life a bit too quickly. Really, I needed more time to recover emotionally to come to terms with what had happened.
But, it's definitely possibly to conceive again, so please don't lose heart. (As others have said, the tube can pick up the egg from the opposite side). You've been through a lot, so, for now, please focus on looking after yourself. And, talk to your DH too, so that you don't feel alone.