i would like some advice if possible about possible pregnacy, i have regular periods, 26-27 day cycle. this month i had intercourse at day 15 and 17, my period was 3 days late, which never happens. i then had a light show of blood 3 days late, didnt show on pad, today 4 days late, i have low abdominal pain and light flow, but the blood darker in colour, and fresher looking. and a small clot, but still very light. not at all like me, usually very heavy first two days. please help. confused. could i be pregnant? joanne.