Ok so it’s my first month using OPK’s. I’ve done a little research so I know what they are generally supposed to look like but I’m a tad bit confused at mine. On CD 15 at about noon I took an OPK and it looked almost positive. So I read that you should test around noon and in the evening once you get close to your positive. But when I tested that evening it was lighter. So I just tested around noon today and it was darker than yesterday evening’s OPK but a tad bit lighter than the one I took yesterday at noon. Any advise or reason for this. Thank you in advance ❤️❤️❤️❤️❤️