It is advisable to use ultrasound to check whether you are ovulating or not, and it is better not to use ovulation paper to test for ovulation because ovulation paper is easily interfered by other factors, resulting in false positive results. If you are ovulating, you can use ultrasound to monitor whether there is a mature follicle, if there is a mature follicle, usually within 1-2 days of ovulation, so the probability of arranging timely coitus to get pregnant is greater. Using ultrasound to check the ovaries to see how the follicles are developing and whether the mature follicles are rupturing and discharging the eggs is a more reliable method, and the observation is more obvious, not prone to erroneous results, and will not be affected by factors such as coitus. Ovulation test paper test, if it is before the menstrual period or after the egg is discharged has already combined with the sperm to form a fertilized egg, the test result will also appear positive, so it is easy to have false positive results.