How likely is it to get pregnant on the nexplanon implant, I've been on it since July. My boyfriend and I have unprotected sex every night, no he doesn't pull out. Recently I've started having breast tinderness, a abdominal discomfort, back pain, fatigue, and nasua in the morning. Is anyone else experiencing this? I had a pregnancy test but it's only been 3 weeks since we've started having unprotected sex.. Any advice, or feedback on the nexplanon?