Can pregnancy be detected with an ovulation test, and is it certain that an ovulation test will be positive after pregnancy?

Patient's question:

Hello expert, after pregnancy, the level of luteinizing hormone in the body increases, does it mean that the ovulation test strip will definitely be positive? I have had a high temperature for 15 days, and the ovulation test strip shows negative, is it because I am not pregnant? Some people say that the ovulation test strip can detect pregnancy earlier than the early pregnancy test strip, is there any reason for this? Thank you

Doctor's answer:

Hello, pregnancy should be tested with early pregnancy test strips.