Can someone help me I had unprotected sex in July and we thought I might have been pregnant so I took a at home pregnancy test and it came up negative I don't know if I did it wrong or what but I still had a period it was light and only lasted 3 day but now I have been on it for 2 weeks and it is very heavy and I have a lot of pain in my lower and upper stomach

Sounds like you are not pregnant, if it continues you need to see the doctor

July? When did you take the pregnancy test and when was this last period? Are you on it now? Sorry... your post is a bit confusing.

A two-week long period is not normal, especially if you are bleeding heavily and in severe pain. I suggest calling your doctor asap.