Where's that Family I was talking about??

Children? Yes please! When? Why not now? Brad and I had wanted more children, we had decided upon three more, yes four children! We had to have an even number. Coming into a family that was already made with a little one and a husband was a change, but a good change and a plan that I knew God had in my life and I wanted to embrace it. We both wanted more children, I wanted to be that biological mother, yes Hailey was mine and Brad had said many times and still does, she is more yours than anyone's and anyone can look and tell that. But there is just something about a woman that wants to see what she can make... Well we decided to start trying to have Hailey a playmate so they would be close in years.. We began that journey Christmas 2006 after getting the ok from my heart doctor at a Uva visit and never imagined what road God would take us on from there.. it was a long, trying, and sad road, one that we are still on and one that I wish for no one to ever have to go on. But through everything, through every valley, God has the mountain at our site if we just trust him and believe in him and the mountain tops of glory and miracles in his plans, we just thought it would be easier than this.. :( Why is it so hard to have a baby? Something that God made woman to have as a natural course on earth?