I had unprotected sex on 19 october & my period is of 31 days .I have my period on 1 nov but this time there were bleeding on first day & then brown spotting & clots & cramping in abdomen .this lasts for 4 days. But my period lasts 6 to 7 days each time. I took hpt on 11 nov & 13 nov both are negative. I have my next period on 28 nov which is 3 days earlier. I have the symptom of tire ness little. Can I be pregnant?