A gray mark on the eleven day ovulation test could be pregnancy, but it’s not certain, and the test may be inaccurate if taken too early. When a woman has intercourse during ovulation, once the sperm and egg combine to form a fertilized egg that will implant, the human chorionic gonadotropin (HCG) in the body will rise, and the chorionic gonadotropin in the urine will also rise, and the pregnancy can be tested by checking the blood HCG level or by using a test strip. A gray mark on the eleventh day of ovulation may be a sign of pregnancy, perhaps due to the short duration of the pregnancy, so the test paper shows a lighter color. It is advisable to retest the test two days later. If the test is still positive, there is a higher chance of pregnancy. Since the test is taken earlier, the error is larger, so the gray mark does not mean that you are pregnant. It is recommended to use the test paper again after 2 weeks of intercourse or to check the blood HCG level after one week of intercourse to determine whether you are pregnant or not, the accuracy of blood test for HCG level is higher.