Me and my girlfriend had unprotected sex on 27th july and she took unwanted 72 after half an hour. She had vomiting after 3-4 days and on 2nd august she got brown few drops of blood which turned dark red after a day and lasted for 3 days (it had no clots. She took a home pregnancy test on 10th aug, 15th aug, 21st aug, 28th aug and it all came back negative. Her periods was due on 14th aug. But she had an exact period like bleeding (red with clots) for 4 days (31st aug- 3rd sept) Is there any chance of her pregnancy?