Question about one attempt at positive opk
When I got pregnant with my son I was using opks and temping so I knew the exact day I ovulated. I found that I always would get my first positive opk in the evening and then my temp would spike the next day meaning I ovulated that night within 12 hours after my first positive opk. Since I ovulate so soon after my +opk wouldn't that really only give me a slim chance of getting pregnant by doing one attempt at positive opk each month? Should I try every 4 days instead?