Confused af

Iv been fighting this battle of is it my new nexplanon or am I prego since I didn’t wait the whole week to have unprotected sex. All test have been negative (haven’t tested in a few days) and I am now 5 days late! today I also have pink mucus when wiping and my boyfriend said he saw brown discharge too.....is this a sign of early pregnancy or did anyone experience this with a first month on nexplanon?