What Causes Increased Discharge And A Missed Period After Having Nexplanon Removed And Having Unprotected Sex?

I recently had my Nexplanon removed and had unprotected sex in the following days. I waited two weeks to take a pregnancy test, which came back negative. It has also been a week since my last period. I have noticed an increase in my usual discharge, but it is within the normal range. What could be the reason for these changes?