Help!!!

Hello everybody at <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>. I just have a quick question. I have had the implant for 4 weeks now, got my period two weeks ago, everything was normal. On friday I had sex with my boyfriend. We used protection cause we were told to use it for at least a month, and he came outside. Now I’m expelling brown muddy liquid and it has a weird smell. Is this normal? Should I worry? Am I pregnant? Help!!!