The emergency contraceptive pill does not cause a false positive urine pregnancy test or ovulation test. The main component of the emergency contraceptive pill is progestin or estrogen, and when patients take a urine pregnancy test, it is mainly to check the concentration of HCG in the urine. Therefore, when a patient takes the emergency contraceptive pill, it will cause an increase in progesterone or estrogen and progestin, but it will not cause an increase in the patient’s HCG level, so it will not cause a false positive urine pregnancy test. The patient’s ovulation test is mainly to detect the concentration of luteinizing hormone in the patient, so an increase in estrogen and progesterone levels after taking the emergency contraceptive pill will not cause a false positive ovulation test. If the patient has both results after using the emergency contraceptive pill, or if one of the two results is a false positive, it is not related to the emergency contraceptive pill and should be considered to be due to other causes.