ano b ibig svhin ng early pregnant and implantation bleeding

kc po last mens q is march 23,dpt mgkkaroon aq ng april 23,kso nadelayed cia ng 4days april 27 ngkaroon aq pero mhina lng at dark brown ang color nia tpos ngcacrumps din aq at msakit ang likod q n kla m pgod s trbho...ano po b ibig svhin nun?