Okay, usually my period is heavy every 28 days and lasts for around 7-8 days. This time my period was almost 2 weeks late, the first day i had some nasty cramps and spotted twice then had absolutly no bleeding. The next day i had thick dark brown/red bleeding that did not even go on any pad, there was even clotting. The 3rd day i bleed kind of in the middle of heavy and light,blood was still dark. The 4th day i barely even bleed at all. i waited almost a week after that and took a pregnancy test but got a negative result. Could i still be pregnant? I never in my life had an off period like this and i'm not under any stress or pill or anything, also no diet or change in my life. Please i'm anxious to know if i'm pregnant or have something else going wrong with my body, i'm only 21, not sure what to think. I've been in a steady relationship for 2 1/2 years, of course i live with him and we have unprotected sex... i just need some advice!