When to use ovulation test.

Amanda
Okay ladies I've started taking metformin and progesterone and will take clomid on cycle days 3-7. The ovulation tester I bought has 7 tests in it. So my question is when should I start testing? I haven't ovulated (that I know of) in the whole 2 and a half years my husband and I have been trying. Should I test every day? Twice a day? Help me? Should I start testing during the time hubby and I have to BD on my chart?