The best replacement for due date is conception date.

The best alternatives to due date are rated as following:
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★★★  planes trains and automobiles
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★  due-date
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Your alternative for due date is not listed? Suggest!
Speaking about due date, one probably shouldn't forget about conception date.

Other search terms related to due date and their ratings are:
★★★★★ conception date
★★★ last period
★★ ovulation date
★ lmp
★ last menstrual period
date of conception
You have in mind a companion for due date and it is not yet here? Propose!



Google Trends

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due date
conception date
delivery date