Pregnant on Nexplanon

Has anyone experienced conceiving while on Nexplanon? I missed my period for the month of November and haven’t gotten it yet, but am unsure if it’s because of pregnancy, stress from law school finals, or the fact that I started working out more. I have been nauseous (no actual vomit), but also not sure if that’s from working out. I started working out in September 5-6 days a week heavy lifting and cardio. Just wondering if it’s happened to anybody and if so, how did you find out/know?