The reason for not having a period even if the test paper has one bar can be due to too early testing, irregular menstruation, amenorrhea and so on.
1. Test too early: after a short period of time, or individual differences, the pregnancy test can not test, manifested in the test paper a bar without menstruation, you need to go to the hospital to take a blood test of HCG to confirm whether pregnancy.
2. irregular menstruation: more than ten days after the menstruation test paper test or a bar, this situation is not likely to be pregnant. You can further go to the hospital bleeding test HCG to rule out pregnancy, you need to ultrasound check the thickness of the uterine lining, if it is more than 9mm, under the guidance of the doctor to use progesterone to regulate menstruation. If the endometrium is below 7mm, you need to use estrogen and progesterone to regulate the treatment.
3. amenorrhea: test paper a bar menstruation does not exclude amenorrhea, leading to amenorrhea for many reasons, such as polycystic ovary syndrome, thyroid dysfunction, pituitary tumors, hyperlactatemia, diabetes and so on.
For the test paper a bar did not come to menstruation, need to go to the hospital for a clear diagnosis, under the guidance of the doctor to treat, can not be used on their own indiscriminate use of drugs, to avoid leading to adverse consequences.