Dear sir. I was engaged. With a girl who is engaged in a relationship with him for the first time on july 5. It was the sixth day of the period. After the second time, our relationship was built on july 12. The next day, her vagina is bleeding. Then on july 14, it was the pregnancy test was negative. Today 8 days. It is yet to start bleeding. What could be causing the bleeding? he takes the antibiotic ciprofloxacin tablet was sympathetic but it does not stop the bleeding. What cause bleeding? and to stop the bleeding and what should we do? please help me sir.