I had been very regular in my periods and it is always fixed for 28 days cycle. last month I had my periods 1 week late but it was like as it happens and this month i had my period on same say when it was due but it was just for half a day. i am also trying for baby but not sure if I had sex during my fertile days. can it be due to some harmonal problem? I am lso having pain in lower abdomen since my period gpt delayed by 1 week. doctor says it could be stress. what should i do. last month i took two pregnancy tests but is was negative, this month I did not take any after i had my period for half a day because it take morale down when test is negative and u have hope. Please share your thoughts. !!!