Maybe Pregnant?

Kaitlin
Has anyone here fallen pregnant on the Implanon? My period is late by 6 days, and usually that wouldn't concern me because my period is all over the place, but I've been on antibiotics for a few weeks and my doctor warned me that they would make my contraception less effective, and during this time my boyfriend and I have had unprotected sex. 
So I was wondering if it's really as rare as they say?