Need to vent

So an old friends came over last night to visit hubby and I and they brought their 11 month old along. I held and played with him all night I absolutely loved him. Now I am feeling down the day after because I am wishing I could have my own little baby. After 5 months TTC and my period being due in a week without any indication or signals from my body that I am pregnant again this month I am feeling down. My mom concieved after two months! Why is it so hard for us?! I'm very sad! :(