What Causes Delay In Periods And Tiredness While Taking Nexplanon?

hi I m on nexplanon and I think it s broken. Well I can feel the break. I had a period regularly for 3 months and I was supposed too get my cycle on the 17th but still nothing. I m tired and lazy to the point I don t feel like working. 1 more question do you ovulate on the nexplanon cus I have been I think