Lost in what to do

Shelia
So I have a 7 year old son. I have Been trying to get pregnant again since he was 1 I love kids. I have had 4 miscarriages and have not been able to get pregnant since. I had my last period July of 2015. I mean I didn't think I could have such problems trying again I am 25 years old doctor says nothing is wrong down there. Anyone have some good advice or any way of which direction I should turn now ??? I am so confused