I got Nexplanon inserted September 11 and on September 18 I had unprotected intercourse with my boyfriend. Along with Nexplanon we had used spermicide. He did came in me. On September 28th I started spotting brown, pink and red ( sometimes a little sometimes a lot when I wiped but never a lot on pad). This lasted until Oct 10, making it spotting for 12 days. A week later on Oct 18, i got my period. Could the spotting be implantation bleeding or side effect from Nexplanon?