losing hope!

Well me and my boyfriend  have been together for almost 7years and we  have been trying for almost 4 years well last year I got pregnant and then had a miscarriage. So we have been trying ever since well we had sex all this month and I'm not supposed to start till July 1st but today I have been haven stomach cramps and all. Could that mean something? I'm starting to lose hope all our friends are pregnant or haven kids and we aren't yet and there isn't anything anything in this world that I want more then to be a mom.