Bright red bleeding for 3 days 5 days before period was expected brown on fourth day no flow like period implantation or period ?

If you menses: Are on, it's not likely gonna be implantation bleeding in that 4 days prior to cycle the embryo is microscopic. Try a upt if it's a possibility. Reasons for earlier menses are broad but it usually self corrects. With no pian should be fine if one time event. If bleeding becomes irregular go in, usually a birth control pill will help. Gd luck.