Period for 14 days now

Adilenne

So I’ve been on my period for 14 days now heavy flow and I’m freaking out.. past 4 months I was having clots when I was on my period and last month I went to the er because I was not feeling well and a big clot came out it looked as if I had a miscarriage or something but they said I wasn’t pregnant at all.. I was given megestrol for the heavy bleeding and because I had not ate in a week and also gave me iron pills.. I was not on any birth control and I had sex on one of my fertile days and I’ve taken some pregnancy test and try come out negative. Anyways lol has anyone ever had period that long? Should I worry? Or what do you think it could be?!