What is wrong? TTC after miscarriage.

I was told that a miscarriage can be a sign of hope that you can actually get pregnant, but it still doesn't make me feel any better knowing that I lost a baby. My husband and I have a beautiful 1 year old boy that we conceived two weeks after trying and are now TTC again. He deploys in a year and we want him to be here for the birth, but that may bot happen now. I went off the pill January 22...2 weeks later I was pregnant.. 7 weeks 2 days later m/c, ttc immediately after bleeding stopped but started my period April 19th. Doing OPK's now and it's never positive, it's so frustrating and heartbreaking. 7 of my friends are pregnant now, and I am SO happy they don't have to go through what we are going through, but it's hard to not have anyone understand or to have answers/ways to fix things.