For those who ovulate early

Jackie • wife | mama x 3 | life luvah | 🌈 due 11-1-18
When do you start testing on opk's? I had my peak lh on cycle day 11 last month and started using the dollar store ones the day after AF, but since I splurged this month on the digital one it only comes with 10 and I don't want to waste any.