The depth of a pregnancy test cannot be assessed in terms of probability, a pregnancy test is a state of uncertainty and non-exclusion of pregnancy. This can be caused by a short period of pregnancy, a problem with the quality of the pregnancy test, or taking the test after drinking too much water.
1. Short pregnancy time: the pregnancy test stick is to test the HCG value of human chorionic gonadotropin in the urine, if the pregnancy time is short, the HCG value in the urine is insufficient, and can not be fully tested out, and shows a weak positive. You need to test again in two days, if you are pregnant, it will become two bars, that is, positive.
2. pregnancy test quality problems: pregnancy test expired, or other quality problems lead to no pregnancy test weak positive.
3. Drinking too much water: before the test because of drinking too much water, dilute the urine, resulting in the test due to the HCG value of the concentration of low leading to a weak positive, available in the morning for the first urine test is relatively accurate.
Pregnancy test a deep and shallow can not be described by probability, the result is only “yes” or “no” one of the two answers, it is best to go to the hospital in time to take a blood test HCG to confirm whether the pregnancy.