I am a 25 year old, 150 lb, 5"9' female, that is slightly active, and have regular periods.
I started my period on December 19th and it ended on December 24th. It was not an unusual period. On December 25th I had unprotected sex. I started spotting on Friday, December 26th and have been spotting off and on since then. What could this possibly be caused from?