I have been on birth control for the last 4 years. The first year I was on pills, 2 years on the depo, 3 months with the arm implant. I have been off birth control for the last 6 months to start having a period(the doctors believe me not having one made me sick) after being taken off birth control I was having a normal cycle starting around the same time every month for the 6 months. Never missing one or it being late. I just recently started birth control pills again because I have become active again. I just finished my last row of birth control pills and I am 4 days late. Should I be concerned because I was having unprotected sex before I took the pills? Or could it be my body responding to the pills?... Help.😳