On the 31st of July I took an emergency pill after 1.5hours after being with the boyfriend. I'm 17 and was really sick and that caused my period to come 10 days early... That was in June, July my period came on the 19th and stayed 5 days and that's why I was expecting to come around then but I got my period on the 14th of August, two days ago and it was heavy with the back pain and cramps and I got acne the week before but it stopped today?! I'm really scared this is implantation bleeding. I do not want to become pregnant at this age