Ovulation tests

I'm just wondering if anyone else has had issues with clearblue digital ovulation tests? I saw my gyno last week and she said to use the digital ones since they are easier to read. So I went and bought clearblue dig. last Thursday and took one. It said I was not ovulating, then the next morning I tested and it said I was on my peak day!?! So my SO and I bd'ed Friday and Sunday of this last week. Now today I have had a crampy uterus all day and super tired. Took another ovulation test because that is usually how I feel close to ovulation. And AGAIN the test said I was on my peak day? So I'm thinking maybe the tests are faulty or something? Just wondering if anyone else has experienced this? Thanks