Venting no bfp

We have one beautiful daughter who will be 4 in the next six months and have been TTC for the last year. I have had two periods in that time frame. No BFPs and its so discouraging. I had a period about 5 weeks ago and every test I've taken in between that time and now has been negative :(  can anyone relate? I'm so discouraged and sad. We want to add to our little family so badly. It was so easy getting pregnant with our first.