Generally taking emergency contraceptive pills will not affect the test results of ovulation test paper, so it is effective. Emergency contraceptive pill is a preparation containing a large amount of progesterone, and ovulation test paper is through the test urine luteinizing hormone to determine whether ovulation, so taking emergency contraceptive pills with ovulation test paper is also effective. However, it should be noted that taking emergency contraceptive pills may interfere with the hormone levels in the female body, resulting in irregular vaginal bleeding or menstrual disorders and other clinical manifestations, so for women who do not have childbearing requirements, it is recommended that they use condoms or take short-acting contraceptive pills or use intrauterine devices to contraceptives. Meanwhile, it should also be noted that the results of ovulation test paper is only a reference result, if necessary, you can go to a regular hospital, under the guidance of a professional doctor in the ultrasound to monitor the development of follicles and discharge. The use of the above medications should be in accordance with medical advice.