I had a cp on 3/22/16, glow has my fertile week as this week, so I've been testing twice a day since Monday! Tests were really faint but gradually getting a lil darker. I just wanna make sure I'm reading them right this is a negative opk, right? Out of all the ones I've taken its the darkest so far. I'm guessing or estimating my ovulation date as April 2nd or 3rd, or the 4th & 5th! Will continue to test until I get my positives! :-)