First of all, there can be no accidental pregnancy. We know where each other has gone to school every day. Why does this happen
Condition Analysis:
According to your description, generally, when a child is 17 years old and hasn't come to the physiological period for 35 days, it is impossible to get pregnant. That is, it belongs to menstrual change. If he can come to menstruation in another two days, it is also normal. Generally, it is normal to come to menstruation in advance or one week later. If he can't come in more than one week, it belongs to irregular menstruation.
Condition Analysis:
What you said is 100% accurate? Your sister's menstruation hasn't come for 35 days, and she must not be pregnant. Then it is necessary to consider environmental factors or lifestyle changes, such as staying up late and tired, bad mood, sudden changes in the environment and so on. It is suggested to improve lifestyle and environmental factors
Condition Analysis:
The occasional advance or delay of menstruation within seven days belongs to normal physiology, so there is no need to worry. Factors leading to irregular menstruation, many external stimulating factors, hormone level disorders or large emotional fluctuations will lead to delayed menstruation. Sometimes Qi and blood deficiency, qi stagnation and blood stasis, and palace cold will also lead to delayed menstruation.
