i had an period sept 25 after i miscarried aug 25 , my " period " which was light spotting came oct 21-23 but i was suppose to start that 23rd of oct . and now im 4 days late this month i was suppose to start on the 16th . found out i have an ovarian cyst can those stop your menstrual or can i possibly be pregnant ? when should i take a hpt ?