My Name Is Carissa!

Well..About Three Weeks Ago..I Used The Bathroom And I Noticed There Was Some Light Spoting Like 3 Days Before My Period Which Was On August 4 My Period Was Due On August 7..Ever Since Then It'll Get Heavier But It Was My Regular Period..It Went On fOR 3 Weeks..5 Days Before My Period I Took A Five Day Pregnancy Test And It Came Back Positive...Then I Went To The Hospital For Another And It Came Back Negitive..I Dont Know What This Is..What Should I DO?