I had it the whole 3 years and didn't get pregnant it's a good bc. If u ask me
I had nexplanon for a short time, about a year, the chances of becoming pregnant while on it are extremely slim because it doesn't allow your body to ovulate. Hence why you may have periodic spotting and such.
A friend of mine got pregnant on it and I got pregnant a month after getting it removed! Every woman is different but I hated it. Its nice to not have to remember a pill everyday but it made my hormones crazy, I was depressed constantly and after months of not bleeding, I started bleeding daily. But I have heard lots of women loving it too!