What Causes Stomach Cramps And Heavy Bleeding?

My period is late for 14 days. During those 14 days i was moody, i didnt have much of an appetite on certain foods i was very picky, i tend to urinate a lot felt like a bladder infection, i tend to feel tired a lot, & i have back pains. I took a pregnancy test 4 days ago it said negative. And the box indicated to wait for 3 mins. And then i urinated on the test on my 3rd urination of the day it had a faded line and then went away when the stick was dry. Now i am having cramps, sharp abdominal pain, and heavy bleeding. Like i havr my period.Do you know what might be wrong with me?