I had to take a week break between birth control methods. I had unprotected sex and felt exactly like you do now. I could remember thinking about it right after and couldn't get that thought and feeling out of my mind for anything. I was pregnant. Don't dismiss your (very keen)intuitions. Although it only takes a week off the guessing game there are early pregnancy tests on the market now. If at all possible make the earliest appointment possible for a blood pregnancy test at your doctors office. It's the earliest and most accurate test you can take. Good luck and I can't wait to hear the results.