Nexplanon expired but still in my arm?

I was supposed to get it out in August of 2015, (nearly 9 months ago) and I still haven't been able to get it out yet (financial issues). I also haven't gotten pregnant though. Am I still protected by it? Me and my hubby use a condom sometimes, but most of the time we just use the pull out method. (I know, not 100% safe) And I track my cycle and we try not to have sex near my ovulation period.

Is it likely that the Nexplanon is still working? Or is the pullout method and avoiding ovulation period working? I've read a lot of material that say some men can tell when they are about to release sperm, so they know when to pull out. (Also, he always pees multiple times and bathes before we have sex again, so no leftover sperm in pre cum)