First it started as light menstruation and now its little bit heavier,
I went to the clinic yesterday and gave me a pill which stops the bleeding
After few minutes I drank it I had terrible cramps and this bleeding
Has been going on for 2 weeks now. I did a pregnancy test yesterday
It came out negative. Anyone knows what could be wrong with me.

I would suggest going to your doctor asap. Non-stop bleeding is not something that you want to leave for long. It could be something very serious.