PREGNANCY & FERTILITY · READING GUIDES
Understand the dates.
Know the assumptions.
Three short guides with fictional worked examples and links to the calculation sources. Read a guide, then choose the matching free calculator.
Pregnancy weeks explainedUnderstand pregnancy weeks and days, cycle-length adjustments and how to use a provider-assigned due date. Worked DayCalc examples.Day-3 and day-5 IVF datesLearn how DayCalc estimates IVF due dates from embryo age and transfer date, with verified day-3 and day-5 examples.Understanding ovulation estimatesUnderstand DayCalc’s calendar ovulation assumption, its six-day window and the limits of estimated fertile dates.