The difference between menstrual precursors and pregnancy precursors

Premenstrual period due to the influence of hormones in the body, women may be accompanied by breast pain, abdominal pain, dizziness headache and other symptoms, and the most obvious sign of pregnancy is delayed menstruation, there may also be similar symptoms mentioned above, in addition may be accompanied by nausea and vomiting, lethargy, fatigue and other discomfort, can be delayed in menstruation for about a week under their own detection.