Getting frustrated

Sara
So July 2015 I had a miscarriage which was me and my husbands first pregnancy and I was only 3-4 weeks along. I got a clear positive when I started feeling cramping and then 1 week later I was confused because my period was starting but it was super heavy and painful and that's when I learned it was a miscarriage. 
We were devastated and we have been trying again. Now it's Dec and my period is 5 days late...I've taken 4 tests and nothing. I feel like I did before except without the pain and bleeding. Currently, I have sore breasts, lack of appetite, strong aversion to certain smells, light cramps that I barely feel, fatigue, frequent urination, and occasional dizziness/light nausea. 
Why am I still having negative tests if I have all the symptoms and my period is so late??? My period is never ever late! I'm always a 30 day cycle girl and it's never been this late....
I'm so frustrated!!! I just want this to happen for us because I know we will be good parents. 
Is it normal to have a late period and negative pregnancy tests? If I'm not pregnant where is my period??