my period begin on Friday by Sunday i was finished and i know that i am not pregnant !
what cn be the cause as this has never happened to me before, has this happen to any one else and what did they do.
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You've actually already answered your question. If you have a 25 day cycle then your period will start on day 1 and occur every 25 days!
Yes. From the first day of the last period you had - count forward 28 days (or when you expected to start). Day 29 would be 1 day late.
1.6g / BW/day
If you mean "how many hours are IN one day", then there are 24 hours in a day.
The menstrual cycle begins with day 1 which is the first day of bleeding. The last day of the cycle is the day before the next period begins.