FMU and opk test strips

Crystal
So what's y'alls thoughts on using FMU to test for ovulation on Walgreens ovulation test strips? Glow says ovulation should occur on or about Friday. I haven't gotten a positive yet but yesterday and today the test line was darker than when I didn't test with FMU. I just want to make sure we don't miss the big O this time! Thank you in advance!