I only have 2 opks left

Sara
I'm using the clearblue digital advanced. I'm cd 14 and haven't received a high or peak yet. These tests are expensive and the remaining tests I have will get me to cd 16. Last cycle I got a peak at cd 13 so I'm probably ovulating later this month. Should I buy a new box or just keep bding until af? I would rather start fresh with a new box next month of af shows this cycle

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