Day 18, still no opk

mariclaire • married 5/12/15 • ELP 4/23/16 • MLP 3/26/20

I got pregnant my first month trying for my son in 2015. Now my husband and I are trying for baby #2 and haven’t been able to get pregnant for three months. It’s not a lot of time to be actively trying, but we haven’t used protection in the almost three years since having our son. I’m extremely regular with a 30 day cycle. I’ve started using opk’s to better predict. It’s day 18 and still no positive. Is it too to ovulate at this point?