So iv been on the contraceptive implant for two years now, It makes me have a period once every two months so me and my bf had a holiday booked for a week, in that week my period was due so i went to the docs to get some medication to delay it. I don't know what its called but it begins with 'n'...anyway the doctor told me three days after i stop taking it i will have a period and it will be really heavy. But my period didnt come till 5 days after and it was very light and only lasted about three days i think, im kinda worried that maybe i am pregnant?