Late period on nexplanon


So I’ve had the nexplanon implant for a little over a year now. Since I got it I have had super irregular bleeding, usually getting a regular 5 day period twice a month with bleeding in between. I haven’t had a period since the last week in August, I spotted once for a day since then. <a href="">Eve</a> is now telling me I am 10 days late. I had all the symptoms of getting my period: tender breasts, back pain, irritability but no period came after. Is this normal?