Clearblue Advanced OPK.

Lauren • Trying for our rainbow baby 🌈 👶🏻 ❤️

First time using these and on CD16 and it's still showing low (no smiley) I usually ovulate between CD 16-18. Should I be concerned? To be fair I'm not getting egg white CM yet but I thought it should be showing high by now? I'm taking the tests using the first wee of the day as per the instructions.