Eh I like Rudolph <| sep |> I feel like we need to make a sticky post about opks , because it ' s one of the most common questions aside from , when will I get my period again ? I use wondfo opks because they ' re cheap , I test three times a day starting about a week before I expect to ovulate . The LH surge can last anywhere from 8 to 12 hours . Or more or less than that , our reproductive systems are trolls . If you only test once a day , you ' re highly likely to miss the surge and mistakingly think you ' re not ovulating . To sum it up , buy cheap tests and test more frequently . Edit regarding EWCM , I get mine a few days before and after ovulation . Also , a few weeks ago I tested first thing in the morning and the second line was darker than usual , but not super dark . Tested a few hours later and got a positive . I don ' t usually test THAT frequently , but my husband was leaving for the airport that afternoon so I was really eager to get it .