2 years later and period

Ludmila

So I’ve had my Nexplanon for 2 years now. I got it in Jan of 2021. I got on it to stop my period because my cramps were extremely painful to the point where I could t function. Well once I got it, NO CRAMPS OR PERIODS! But I’ve noticed I’m getting a period every now and then and I’m only 2 years in???? Is it an real period or no???? Is it time to change my Nexplanon even though it’s supposed to last for another year???