I got my implant out December 2013 (5 months ago) I had one bleed brought on by taking the morning after pill. Nothing since. I've had plenty of fertile looking cervical mucus but no proper periods or positive pregnancy tests.
My gp recommended waiting 6 months before worrying about no period. And unless I have pain in my abdomen there isn't anything she can do.
I don't want to be a downer but it's common for cycles to not come back for several months after coming off birth control. Also to add, I fell pregnant with my son on my first cycle before my first af when I came off the pill, so it's possible you're pregnant.