Has anyone every had the Nexplanon implant and gotten pregnant on this?

My implant isn't due to come out until 12/24/16. I have been on oral antibiotics for several months and I have been having pregnancy symptoms. I spotted for 4 days from 11/27-11/30 and now I am bleeding again starting 12/8. Last time was very light this time is still light but definitely more then last time. I haven't had a period in a very long time since getting my implant so I don't really know how to set up my charting. Hoping someone else here would have some advice. Taking test tomorrow morning. TIA