The best replacement for conception date is due date.

The best alternatives to conception date are rated as following:
★★★★★  due date
★★★★  lmp
★★  ovulation date
★★  weeks pregnant
★  last period
★  implantation date
★  first day of last period
  gestational age
  first day of last period for due date

Your alternative for conception date is not listed? Suggest!
Speaking about conception date, one probably shouldn't forget about due date.

Other search terms related to conception date and their ratings are:
★★★★★ due date
★ pregnancy due date
★ known due date
due date calculator
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Google Trends

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conception date
due date
lmp