Counted based on LMP, therefore must follow Nigeal’s Rule which is
1) Regular menses
2) Not on hormonal contraceptive
3) Not breast feeding.
1) Find LMP
2) Minus date of clerking with LMP
3) The months show additional day and week based on above tables
4) Change the months and day into week and then plus with additional day and week.
Date of clerking: 25/8/08
POA: 4 months 22 days
4 months = + 1 week 2 days
Therefore, 4 months (16W)+ 1 week + 2days + 22 days (3W+ 1days)
= 20W+ 3days.