My discharge is white and pasty looking but mostly clear .. is that bad? or is tht normal? im alitle scared , ive had a yeast infection before so im scared it might be , i get my period this week and im on nexplanon if that may be the case?

You're the best judge of what's normal for you. If your vaginal fluid has changed or seems abnormal, get it checked out. At your age, STDs are common causes of changed discharge -- but of course only if at risk (new or multiple partners, partner with other partners, etc). Yeast infection usually causes itching and irritation, usually with only scant discharge or none.