OPK tests are inconsistent! Please help!

Hi girls! I am scheduled to have my first natural IUI as soon as I test positive for an LH surge. I usually test with the wondfo strips but decided for the first time ever to also test with a digital opk (Walgreens generic brand). I thought I got a blazing positive on the strip but the digital still says no surge. What do you think? What should I do? Should I call my doctor and schedule the IUI? Has anyone had this happen?