Aloo

Hi,
I know i messaged last week but now i'm 14 dpo and only got brown discharge. My lower back slightly hurts...i should have gotten my period yesterday but instead for the last 4 days i've been getting this brown/dark red discharge everytime i wipe. During the day there is no staining but then at night i use a panty liner and in the morning it has stained the liner....i'm getting worried. Has anyone gone through this? What is wrong with me!!!!
Please can anyone tell me what to do? Do you think it's sign's of early miscarriage?
Aloo