Negative result

My partner and I have been trying for over 3 year with no luck. We're both in our late 20's and healthy. We're both so desperate for a child and complete our family. Both of us have been to doctor and have been given the all clear, so why aren't we pregnant yet?

I get so caught up with the idea of having a child that I take a pregnancy test around my period, knowing full well that's it's negative and brings me crashing back down to earth.

The past 2 months my periods have been all over the place, 3 weeks late in July, now 1 week late. I'm trying to stay positive and stay away from the tests as each time it cuts a little deeper when it's negative.

Does anyone else feel like this? And if so how do you find the strength to carry on month after month?