Hello Ma'am I tested for ovulation on 16th April,got 2 dark lines in ovulation kit, I also did test on 17th and 18th April and I also got 2 lines that was lighter than 16th date test. I heard about that only one day we get two lines but I was getting after 16th also,so my question is what will be my ovulation day , I m little bit confused in this. can u please tell that what is the right date for ovulating and also tell what is the duration of ovulation? here attachment..please check