"i had the implanon inserted three weeks ago. insertion was equivalent to getting a shot in the gums at the dentist office after they numbed me i just felt pressure. i started my first period on the implanon it came a week early. if you&#039;ve ever kept taking the birth control pills continuously to miss a period and you still had your period that&#039;s what it&#039;s like so far. it&#039;s light, but it&#039;s probably going to be long. i had really heavy periods, so hopefully it stays light and shortens up."