Weird Period

Okay so I'm confused about what my period is doing. Since I was 11 my periods have been spot on. BC changed it up at the age of 15, I got off of the pill and my periods went back to normal. The only thing that changed was right after I started having sex I was late a few times. Figured my body was adjusting. It went back to my normal 27 days apart, and lasting for about 7 days. I don't think I'm pregnant but I don't know what to think. I was early by 3 days this time, I spotted very lightly day one, bled really heavy day 2, spotted heavy day 3, spotted just barely day 4, and now today nothing. I figured it was trying to trick me and would start up again. Any ideas?? I do have unprotected sex using withdrawal method.