My period is late for 12 days. on my period due date (20th of March 2017) I have spotting lasts for 6 days then its gone. i have done several test at home and all of them are negative until today! i want to make sure that i am not pregnant although i have all the symptoms of pregnancy. i have a scan after after two weeks, does it tell me if i am pregnant or not? and when i can get a definite answer ?