I think i miscarried at six weeks but i only bled for four days.. how would i know if i was still pregnant.

See Dr.: You need to see a dr. And get routine periodic evaluations which may include blood work such as "quantative b-hcg test" which can serially give a number, allowing the dr to know if he levels are decreasing, etc. You also want to assure you have a vaginal exam to see if you indeed did miscarriage and if any further medical treatment would be required. Best wishes.