hi want to know if its normal that period can come 3 days early. and what is the difference between implantation bleeding and menstrual cycle ? because i have used condom every time i had sex (durex) and checked it even after the sex that if it is ok or torned. but it was always ok. and now i am afraid tht my periods was suppose to come 3 days after bt its early ...i am confused and scared please help me