Can't get pregnant

I've read a few postings and I can relate to most of them. I have a four year old and we've been trying for a second child, approx 7 cycles. THis after having 2 misscarriages in the past two years. It's extremely fustrating. My husband constantly tells me to relax, that it will happen, but I can't. We've been fighting a lot lately. He feels like it's become a chore, only on certain days, no spontaneity anymore. And of course to top it off, everyone is pregnant. everywhere I go.... I'm trying to remain positive, but every month I get my period, I get more depressed. Especially because I spend the time before my period analyzing all my symptoms, convincing myself I must be pregnant, peeing on a stick and getting a neg results only adds insult to injury...But every month is a new start, although I'm 37 so I'm feeling that time tick by.