I had unprotected sex two days before before my period in June, a day after the sex I had what felt like my period (this is the day I expected my period to come because it comes around the 20th). That period however was lighter still red but then started changing to light brown/light red. My period is usually a 28 day cycle that last 6 days. Instead of taking a pregnancy test I planned to wait for my next scheduled period in July. My "period" in July came 4 days early and ended a day or two earlier than usual...I had red blood and tiny clots. Is this implantation bleeding? Or was that my period? Could I possibly be pregnant?