You need to go see a Dr asap! They will tell you its not possible, and you may get plenty of negative test results, but I am looking down at my tummy at 17 weeks gone- I had been on the implant 6 months ang it happened! Anyway, my baby is fine and there is no proof it will harm you, but it must be taken out immediately!
Its different for every person. I have the implant and I have lost a baby as I didnt know that I was pregnant when I got it in as I told the nurse that I was on my period when I got it and I wasnt and I though that the implant had stopped my periods but a friend of mine has had a baby when she was on th implant and her baby is prefect! , it depends on the person as everything and every form on contraception does the only thing that can stop you from getting pregnant is to not have sex.