yeah It is determined by the day of your last menstrual cycle began.
The first day of your period, with or without the pill, is the first day of bleeding.
The first day of a womans menstrual period is just that - the first day of menstruation.
Neither, about a week after your period ends is normal.
It's the first day of your last menstrual period.
I think you go by when the sperm unites with the egg
last
Most doctors revert back to the first day of your last period.
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.
your first day of your last period
The date is calculated from the start day of the last menstrual period.
Estimated due dates and pregnancy time lines are calculated from the very first day of your last menstrual period.
Any counting of days regarding menstruation or fertility is always from the first day of your period - LMP is the day you started your last period, fertility window is from LMP - to days 9 thru 16 - the average cycle is 28 to 34 days beginning with LMP.