Sad :(

So my period isnt due until Friday the 12th but I took a test this morning, one of the first response early detection ones and it was negative :( I don't understand why this is happening. When we tried in the summer of 2012 it took one month! I had a MC and decided after that to wait until I felt ready. This will now be 4 months of trying. Why was it so easy with my daughter and so easy back in 2012 and now I'm having a hard time? I'm so sad I just want to cry. I honestly thought for sure that test was going to be positive this morning!