This is my first month using opk. I have easy at home strips and digital clear blue. Yesterday morning I got a positive strip and a solid smiley face, today it was just an empty circle and the test reader says the strip os negative. Is it normal only have one day of smiley face and not two? Should I continue testing? Glow had my ovulation as today but after uploading the test it now says it was yesterday. The picture of strips are 8/29-9/1(today). (I was on antibiotic for a brief time that turned my urine orange, that’s why some strips are colored). Thank you.