Birth control (Nexplanon)

My doctors say I may or may not have endometriosis, They can’t do exploratory-surgery due to covid but they say it’s a high chance I do based off my symptoms. My period cramps are about as bad as contractions (I wouldn’t know thought because I’ve never had a baby) but that’s what they are comparing it to, they are recommending nexplanon to help ease the pain and to help slow down the growing tissue

I’m only 16 and really don’t want a IUD and they’ve given me the pills before 2 different kinds and it just made my period pain worse they even had me take the pills for 3 months straight and then have my period and keep doing that but yet again it jus made it worse. I don’t know what to do dose anyone recommend nexplanon?