Nexplanon and discharge

I got nexplanon in August and got my first period on it about 2 weeks ago, since then I have had a little bit of brown discharge to today brown discharge and stretchy clear egg white discharge. Ive Only ever had thick white discharge on nexplanon. Is it working or have I started ovulating and how do I know? I haven’t had sex in over a month so I know it’s not that. I have also noticed some pain around the area especially after working out and a few day’s after when it’s sore which is strange for me.