Miscarriages & Trying for a little one

Savannah
My fiancé and I have tried for almost a year for a child.  We have come to experience a roller coaster of emotions through the loss with miscarriages over the course of time.  
Recently I came to my ultrasound checkup and the doctor recommended me to do a urine test before the ultrasound. When doing the ultrasound he explained my "insides" we're giving him a bad picture and he possibly may or may not have saw a baby.  
In the past I have had doctors tell me when taking blood tests and they come out being negative I am therefore not pregnant - but after they tell me I have a miscarriage.  
I am very confused and was wondering if anyone was having this much trouble trying to have a child ? I am also anemic and have extremely low blood iron.