I had intercourse on the fourth day of my last cycle (I have a 5-day cycle). It is 10 days past the period's due date. Could I be pregnant? I had done two pregnancy tests, and both were negative. Are there any chances that I may still be pregnant? If yes, why were both tests negative? I had the first pregnancy test four days before the period's due date and another on the ninth day of the period's due date. Please assist.