Ovulation Troubles

My husband and I are trying to have another baby. We had a positive pregnancy test last October but I miscarried at 7 weeks. Once I was ready to go again after having one period in January, we were going at it like crazy to get a higher chance of pregnancy. I've been using OPKs and still haven't gotten a peak.

Am I doing something wrong? Is there a reason I haven't shown a peak yet? We want another baby so bad. Our son is 16 months (tomorrow) and we are ready for another little one.

HELP!!!!