The first day of my last period was the 1st feb 2010, it lasted about 6 days, i had unprotected sex on the 14th and according to the fertility calender i was ovulating on the 15th i then had sex again on the 25th of feb my periods are always on time never a day early,I woke up on the morning of the 26th with light bleeding, it was very light red and quiet bright in colour it was not as heavy as my normal periods and only lasted 3 and a half days(it has finished now and my period was due today but i have had no further bleeding) , i didnt have the normal period pains i just had pains in my lower abdomen on and off. could this mean pregnancy?