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First day of last menstrual period
Estimated date of conception:
End of 1st trimester (12 weeks):
Time for NT Scan
(11 weeks) to
(13 weeks)
Time for Triple Screening test
 (15 weeks) to
(21 weeks)
Time for Targeted Scan:
 (18 weeks) to
(20 weeks)
End of 2nd trimester (27 weeks):
Estimated Due Date:
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