There are symptoms of pregnancy but the pregnancy test can not be measured may be too few days of pregnancy, ectopic pregnancy, pre-miscarriage and other reasons, need to be specifically analyzed. 1. too few days of pregnancy: generally in the menstrual delay of more than a week can be measured by morning urine, if the measurement time is too early, may lead to low hormone concentration can not be detected. 2. Ectopic pregnancy: when ectopic pregnancy occurs, the human chorionic gonadotropin secreted by the human body is also relatively small, and cannot be measured obviously. 3. Pre-eclampsia: In case of pre-eclampsia, the human chorionic gonadotropin in the body will decrease, which may cause the pregnancy test not to be able to detect. If you find symptoms of pregnancy, it is recommended that you go to the hospital in time and under the guidance of the doctor to carry out the appropriate tests to determine whether you are pregnant or not.