Theoretically, ovulation test after pregnancy may be negative or weakly positive. Ovulation test strips are used to detect the peak level of luteinizing hormone in a woman’s body to determine whether there is a sign of ovulation, and luteinizing hormone usually does not increase during pregnancy, so the test may be negative after pregnancy. However, human chorionic gonadotropin (HCG) will rise after pregnancy, HCG is a glycoprotein secreted by the trophoblast cells of the placenta, and HCG is structurally similar to luteinizing hormone, so when the level of HCG is high, a weak positive test may appear if ovulation test strips are used to detect it. Therefore, there is no significance in using ovulation test paper after pregnancy, and you need to go to the hospital in time for the measurement of human chorionic gonadotropin and ultrasound examination to determine whether the condition of the fetus is normal.