What Causes Malodorous Darker Bleeding Two Weeks After Normal Bleeding Cycle?

hi, i am 32 years old and i have always had a normal heavy period around the same time every month and i was suppose to stop around the 3or the5th of the month and i am still bleeding two weeks after, only now its like more darker and reddish not like normal period blood and it has a fouler oder to it. i know i am not pregnant because i only have one falobian tube and one ovary and i have never been able to have a child so thats not so much my concern. i just am scared i dont know what it could be can you please help me?