Wtf did I miss it? OPK results

Question

Started using OPks this cycle and started testing at CD13 when the app Ovia said I would enter my fertile window. But instead of getting darker the opks are getting lighter?  🤔 Wondering if I missed the surge. Expected period is Jan 18th. Should I keep testing?

Answer

I would start testing on CD10.

Answer

You could just be ovulating late or you ovulated earlier than normal. Was cd 13 when you first started testing this cycle?

Answer

I ovulated cd 18 when I got pregnant this time. Keep testing in case you haven’t ovulated yet. You could have also ovulated earlier than cd 13 when you started testing

Answer

How long is your cycle?