Pregnant after nexplanon

Has anyone gotten pregnant after being on nexplanon and how long did it take? I have been off it a year in 2 days and still haven't gotten pregnant. I have pcos so I'm very irregular. I have been using femometer opks and they have been negative. I haven't gotten a positive yet and I have been bleeding every month like af but it's been dark a few days like brown color then a few days its red