Getting depressed

Hi everyone. My husband and I hot married in September 2011 and started trying to conceive right away. In July 2013 I found out I was pregnant and it was that happiest day of my life. In October 2013, we got the worst news imaginable and I had to deliver my baby boy at 21 weeks.
After 8 weeks, when we were medically allowed to start trying again, we did. January of 2014. It has been over a year and still no luck. Yesterday I was supposed to start my period but all I got was brown discharge which is continuing today. This has happened the last couple months, a couple days of this then my period comes on heavy.
My brother-in-law just announced he and his wife are expecting. I didn't take the news well. 
I need help :(