"i and 24 years old and had nexplanon inserted at the end of january of 2016. it has been a relatively tough adjustment. i now struggle with cystic acne, even on my chest and back, especially around my period. i still get a period every month, except now it&#039;s not like clockwork where as before it was. i will say it is much lighter. i am more moody around my period than i used to be. good news is i haven&#039;t gained weight, noticed a change in my libido, or gotten pregnant. i will more than likely call my dermatologist or obgyn to get a prescription for my acne. the side effects aren&#039;t the best but they could be worse. i would take not having an unwanted pregnancy over acne any day."