My period was a week late this month, which never happens. I thought I was pregnant, and was stressing, when I finally started. I was bleeding heavier than normal, and I bled like that for 4 days. Well the 5th day, I didnt bleed at all. I had sex with my boyfriend that night, and after I experienced a lot of discomfort. The next day I was bleeding pretty heavy again. I bled pretty heavy that day and a light the next. What is going on??