hi, I am 19 years old and my boyfriend and i have been having protected sex for 2 months now. recently, on may 14 2015 I had gotten nexplanon implanted into my arm. My doctors instructions were to be sex free for at least 7 days, or if I do have sex to use a back up contraceptive (condoms). Unfortunately, on the 4th day after getting nexplanon implanted, i had unprotected sex for about 1-2 minutes, and then we put on a condom. what are the chances of me getting pregnant? how strong was the birth control on the 4th day? Also, I had gotten the nexplanon implanted on may 12, 2015. So to clarify, i had sex on may 17th. how do my odds look?