Sharp pubic bone pain, sharp pain upon pushing during bowel movement, diarrhoea, nausea normal during period? Never had it before.

Sounds normal. The symptoms you describe are not unusual during a normal period. Many women have diarrhea and nausea during a period. Even though you have not experienced this before, a woman's body undergoes changes all of the time. and most women will have symptoms with a period once in a while that are unusual for them.