I've been using OPK's for a year and a half and every month I get my positive result on day 17. I also get ultrasounds the same day to verify and it's always right. This time I used the clearblue digital that has the blinking smiling face and the solid face, so on day 16 I got a blinking face so I went into the doctor and got the ultrasound and he said I was early and I wouldn't ovulate until the next week. I explained to him that I always ovulate on day 17, so he scheduled me for another ultrasound two days later (day 18). I went in today and he said I was still to early and he didn't think I'd ovulate until Monday or Tuesday (day 22 or 23). I explained my concerns so he told me if I get the solid smiling face in the morning they'd do my <a href="https://glowing.com/glow-fertility-program">IUI</a> tomorrow afternoon but if I didn't they couldn't do an <a href="https://glowing.com/glow-fertility-program">IUI</a> until Tuesday because there closed for the holiday. So if I get a positive Saturday or Sunday, Tuesday will be to late. I'm stressing about this cause it's off from normal and I've been sitting here all week waiting. My doctor is not located close to where I live so I've been out of town waiting on this and it could be for nothing. I know my body and this is way off from normal. Can ovulation come so late in your cycle when it has always came on the same day?