Ovuation calendar says it’s my highest day to conceive but the fertility test says different


Hi guys! I took an ovulation test to see if what my calendar was predicting was accurate but it seems it’s not. My husband and I are trying to have a baby, haven’t been trying long but I always have this thought that it’ll never happen. My ovulation test said I’m “not ovulating” but my calendar said yes I am...... have any of you experienced this?? This was the first time I have taken the test and want to see if anyone has experienced it.