Should I retake it correctly?

Baby

So my husband and I are ttc. AF is two days late. I took a test this afternoon and I saw a vvvvvfl. Not sure if it was an evap... well I just happened to look at the instructions on the test again and realized that I only submerged the test in urine for 5 seconds when I was supposed to submerge it for 20. Should I take another test and do 20 seconds or will another 15 seconds not change the result that much?

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