My period has been late but only when I use Preseed? Yes or no's 🎁

So the first time I used it, I was one week and a day late for my period. I spotted one week before it even started flowing. All of this never has happened to me before. I had a 37 day cycle. The following month it went down to a 33 day cycle. The month I had a 33 day cycle I ovulated on day 15, I tested to make sure. It stayed positive for 3 days then went negative and my period came the day I expected. This past cycle I chose to use Preseed again, I was 3 days late for my period even though I again ovulated on day 15. My cycles are normally 28-29 days, and I spot 2 or 3 days before never a week. This all had ever happened with Preseed. Is it likely I will ovulate on day 15?