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.... i just need some advice!