After the 1st time we had sex after 7 days of her periods & she had taken birth control tablet within 30hrs then again we had sex after 7 hrs then she took the second tablet she had within 72 hrs,her period is already delayed by alnost1week.Now in the fourth week after having sex she is feeling vomitting tendency.Can you please tel me what are the chances of her becoming pregnant & how to stop the pregnancy....pls advice