Abnormal Period

Lo
Wondering if any of you ladies had problems with periods lasting almost a month or longer? I'm already at 4 or 5 weeks in... I called the OB/GYN and they insisted I take a pregnancy test (came back negative) then to make an appointment (which if far out ahead) to see if I'll need a procedure depending on the pregnancy test. 
Just wondering if any of you had any situations like this or similar? Or any advice. 
My flow is regular up to heavy. It goes either or. Cramping isn't bad either anymore.