TTC For Almost 4 Years

I was pregnant at 17 with twin which i didnt know until the sad part I was 2 months in a half but sadly I started having cramps vomiting n bleeding so I went yo the hospital which they told me I was having miscarriage the sad part was i had a big cloth of blooding on my pad so i told the dr so they told me i had miscarry the baby they Send me home a week later I had more pain on my right side with alot bleeding which i thou it was nornal after a miscarry so I decided to go to the hospital which they did me an ultrasound so they saw one of the twins on my fallopian tube so I had to have emergency surgery which I fell on depression after all this , so after the year pass I got pregnant again I was 6 weeks which i started bleeding again sad part is that I miscarry again ever since Idk what to do i been TTC for over 4 years now but with no luck . It's hard I only have 1 tube n I'm having low hormonal problem can anyone help what can I do with my hcg please help we really want a baby