Not quite sure...
To keep it short and sweet... After having unprotected sex (about 12 days before the beginning of my cycle)- I DID have a full length, heavy cycle for the month (flow was more than enough to fill several pads/tampons for the 5 days of my cycle--sorry if it's TMI just trying to paint the picture). My cycle is pretty regular, NEVER missed a cycle and the cycle that I had did not differ in length or "flow" from others in the past. Is there any way I might still be pregnant?
After a cycle like that, I would think that it is very unlikely that you are pregnant.