I spotted all day on 6-27-10 and then I started my period on 6-28-10 which was five days early I have always been on time and regular with my periods. Could I be pregnant?

If you are having intercourse there is always a possibility of pregnancy. However, since you DID get your period, chances are you are not.

Although you say you are regular, every once in a while we will get an irregular period.