I have had the nexplanon for well over 2 years. I have always had normal periods now I'm 2 weeks late. I know missed periods and pregnancy symptoms are side effects just worries me bc I've had it so long with none of these problems. My mom also had an idu when she got pregnant with my sis she was told she had over a 90% chance of miscarriage with her but 24 years later my sister is still here.