Had a miscarriage at 36 weeks

I am new to this have a question I've been trying for 2 years to get pregnant on October 17th 2014 I was pregnant with 36 weeks along he passed away inside of me 4 weeks before having him :( I got pregnant again after March 2015 was only pregnant for 7 weeks had a miscarriage and I've been trying since then and I won't get pregnant somebody help me out or give me advice please !!!! And another thing I always get every month pregnancy test they always come faded lines and I'm not pregnant do you guys know why