Confused…

We’ve have been trying to conceive for about 6 months and I’ve been using ovulation tests, my ovulation usually shows with a very dark line on the tests and have for the last 6 months. This month, nothing the line got quite dark but not dark enough for ovulation, testing numerous times a day and my line has gone lighter and lighter to the point where there is nothing. I don’t feel like I’ve ovulated either, usually get cramping, sore breasts thick discharge but I’ve had nothing. Have I just not ovulated this month? Anyone gone through the same and can help?