Hi, I am also trying to conceive, also had a 28 day cycle and very regular periods that last 4 to 5 days, however, this month I was almost 4 days late and when I did get my periods it was for about half a day,  maybe less and there was no blood like normal.... just a browny dischage with specks of blood.  I have not done a pregnancy test because it is even more depressing getting a negative test than getting my periods at the end of the month.