Advice

Me and my partner have been trying to conceive for three years in the first couple of month of trying we were successful but unfortunately it ended in an early mis carriage. Last week I went to the doctors and they basically said other than a blood test they can't help me as I've been successful in the past which shows I'm fertile. Is it really normal to be trying for so long and nothing!? I'm so worried something went wrong during the misscarriage. Apart from my partners help I feel so alone in all this and was wondering if there is any advice you condo give.  Thanks in advance