unusual bleeding

i have been bleeding for the last week but i am not on my period. tomorrow it will have been 1 exact week. the blood is brown and pinkish and sometimes will have an orange tint. the past two days it has been so dark it looks almost black. it was a little heavy at first like a period but when it started i was due for my period in 12 days. my period usually lasts 3-5 days and has never gone over, especially to a week. i’m really concerned about this. i have had cramping, breast tenderness, horrible headaches, backaches to a point where i need to sit or lay down, food cravings and aversions. i’m not sure if these relate to it but they are very unusual for me and i was wondering if anyone knows what’s going on or has some advice.