Keeps me thinking

I keep thinking I can't get pregnant because I been trying with my ex for five years( well here and there trying) and we had a miscarriage three years ago. But when I went to the doctor to check if I'm ovulating she said yes....wonder if my tubes are closed or its just not the right timing and wasn't meant for me to have a child with my ex....
I'm with someone new now. Wondering will this be different. 
Can anybody relate??