i just got the implant nexplanon a couple of weeks ago and i wasn't on my period at the time so i was told that i wouldn't be covered for contraception until my next period. i'm having my first period since then but it's much much lighter than usual and a different colour. i know that can be a common side effect of the implant so i'm not too worried. but does that mean it's working now? am i now protected against pregnancy??