OPK strips & questions

Baylee

We have been TTC after a miscarriage and decided to use OPK strips. After finally getting a positive I was surprised to see I ovulated on day 18 of my 28 day cycle. Does anyone know if when the tests become negative that’s when you actually ovulate? Since the positive signals 24-48 until you O. Hearts indicate BD, our work schedules were opposites during this time, but we are hoping it was good timing.

Any insight would be helpful!