I've had the nexplanon in my arm since December 11th, 2016 and i've only had one period so far and it lasted 3 weeks and now I have no idea when my next one will start. I had pretty regular periods before the implant and my app says I'm 6 days late but I've only been off my period for like 2ish/3ish weeks now and recently my boyfriend and I had sex back to back, he came the first time then ate me out until he was horny again, and we had sex like 10 minutes after he came the first time and I'm paranoid that even though he never came literally IN me, semen was still on or in his dick and I'm about to go take a pregnancy test right now, I'm just venting really lol has anyone else had period issues w birth control?