ExpectCalc Blog
Evidence-based explainers on pregnancy dating — where the errors hide, how each anchor performs, and how to read a due date discrepancy. New posts roughly every two weeks.
How Far Apart Are Dating Methods, Really?
Same last period, three dating formulas, six cycle lengths: our engine puts due dates 8 to 12 days apart, and a two-week LMP error shifts them 14 days.
2026-10-23IVF Due Date: Day-3 vs Day-5 Transfer
One formula — transfer date plus 266 days minus embryo age — covers fresh, frozen, and retrieval dating, with worked day-3/5/6 and retrieval-only examples.
2026-10-23