From a physiological point of view, the concepts of pregnancy and menstruation are incompatible. We know from school that the inner surface of the uterus is lined with three layers. The most mobile is the endometrium, which grows at the beginning of the cycle. The function of the endometrium is to create a favorable background for the implantation of a fertilized egg.
If conception does not happen, the female cell dies and comes out along with the blood. This process in the female body is cyclical and occurs monthly until fertilization occurs. Thus, for young healthy women of reproductive age who have regular sexual intercourse, delayed menstruation is a reliable sign of pregnancy.
When a fertilized egg implants into the endometrium, all the body’s forces are directed to maintaining the pregnancy. Menstruation stops. Therefore, once conception has taken place, menstruation in its direct sense is always a deviation from the norm. It would be more correct to talk about bleeding.
It should be noted that bloody discharge in the second and third trimester always means pathology. It could be:
• beginning miscarriage;
• premature birth;
• placental abruption;
• death of the fetus in the womb, etc.
At any stage of pregnancy, minor bleeding can provoke an aggressive examination in the chair, a nervous breakdown, or violent sexual intercourse. Fortunately, they pass quickly, but you still need to be careful.
The complex of reasons that cause bleeding during diagnosed pregnancy can be physiological or pathological.